diff --git a/src/game/calculateDamage.ts b/src/game/calculateDamage.ts
new file mode 100644
index 0000000..cab895d
--- /dev/null
+++ b/src/game/calculateDamage.ts
@@ -0,0 +1,75 @@
+import { oppositePlayer, PlayerSide, RoundStarter } from './gameState'
+
+export function calculateDamage(
+    delta: number,
+    player: { readonly damageBonuses: number },
+    difficulty: { readonly damageBonusBase?: number; readonly damageBonusIncrement?: number },
+): number {
+    return Math.round(
+        (delta *
+            ((difficulty.damageBonusBase ?? 100) + player.damageBonuses * (difficulty.damageBonusIncrement ?? 10))) /
+            100,
+    )
+}
+
+export function calculateStops(
+    player: { readonly stopCount: number },
+    difficulty: { readonly maxStopCount?: number },
+): number {
+    return Math.min(player.stopCount + 1, difficulty.maxStopCount ?? Number.MAX_SAFE_INTEGER)
+}
+
+export function calculateFails(
+    player: { readonly failCount: number },
+    difficulty: { readonly minFailCount?: number },
+): number {
+    return Math.max(player.failCount - 1, difficulty.minFailCount ?? 1)
+}
+
+export function calculateBonuses(
+    player: { readonly damageBonuses: number },
+    difficulty: { readonly maxDamageBonuses?: number },
+): number {
+    return Math.max(player.damageBonuses + 1, difficulty.maxDamageBonuses ?? Number.MAX_SAFE_INTEGER)
+}
+
+export function calculateRecovery(
+    victim: { readonly damageTotal: number },
+    recoverer: { readonly damage: number; readonly nextRecoverAt: number; readonly timesRecovered: number },
+    difficulty: {
+        readonly recoverBase?: number
+        readonly recoverIncrement?: number
+        readonly recoverPercentBase?: number
+        readonly recoverPercentIncrement?: number
+    },
+): number {
+    const { damageTotal } = victim
+    let { damage, nextRecoverAt, timesRecovered } = recoverer
+    const { recoverBase = 0, recoverIncrement = 0, recoverPercentBase = 50, recoverPercentIncrement = 0 } = difficulty
+    let recoverPercent = Math.max(0, recoverPercentBase + recoverPercentIncrement * timesRecovered)
+    while (nextRecoverAt !== 0 && damageTotal >= nextRecoverAt && recoverPercent > 0) {
+        recoverPercent = Math.max(0, recoverPercentBase + recoverPercentIncrement * timesRecovered)
+        nextRecoverAt = recoverBase === 0 ? 0 : nextRecoverAt + recoverBase + recoverIncrement * timesRecovered
+        timesRecovered += 1
+        damage = Math.max(0, Math.round((damage * (100 - recoverPercent)) / 100))
+    }
+    return damage
+}
+
+export function determineNextRoundStarter(
+    game: { readonly phaseOwner: PlayerSide; readonly roundOwner: PlayerSide },
+    difficulty: { readonly roundStarter?: PlayerSide | RoundStarter },
+): PlayerSide {
+    switch (difficulty.roundStarter ?? RoundStarter.ALTERNATE) {
+        case PlayerSide.TOP:
+            return PlayerSide.TOP
+        case PlayerSide.BOTTOM:
+            return PlayerSide.BOTTOM
+        case RoundStarter.LAST_ROUND_LOSER:
+            return game.phaseOwner
+        case RoundStarter.LAST_ROUND_WINNER:
+            return oppositePlayer(game.phaseOwner)
+        case RoundStarter.ALTERNATE:
+            return oppositePlayer(game.roundOwner)
+    }
+}
diff --git a/src/game/gameEvent.ts b/src/game/gameEvent.ts
index effd471..5ae1e7b 100644
--- a/src/game/gameEvent.ts
+++ b/src/game/gameEvent.ts
@@ -1,4 +1,5 @@
 import { DiceCombo, DieResult } from './dieState'
+import { PlayerSide } from './gameState'
 
 export enum IncomingEventType {
     // Chooses the action to be performed for this round but does not lock it in until the player rolls.
@@ -20,8 +21,8 @@ export enum IncomingEventType {
     HoldSelectedDice = 'hold_selected_dice',
     ReleaseSelectedDice = 'release_selected_dice',
     // Button 3 is End Turn/Score Selected Dice
-    // End Turn appears by default, but is only enabled if sufficient Stop dice are in the current roll or if the turn
-    // has been failed
+    // End Turn appears by default; if there are not enough stop dice rolled it is "Fail Turn" instead
+    // If there are not enough points, it is "End Turn" with a warning
     // Score Selected Dice appears when any dice are selected, but is only enabled if at least one scoreable die is
     // selected and no non-scoreable dice are selected
     // Both appear during GameState.TURN_ROLLED
@@ -56,10 +57,14 @@ export interface IncomingSimpleEvent extends IncomingBaseEvent {
         | IncomingEventType.EndTurn
         | IncomingEventType.DeselectAllDice
         | IncomingEventType.RollDice
-        | IncomingEventType.Abort
 }
 
-export type IncomingEvent = IncomingIndexedEvent | IncomingSimpleEvent
+export interface IncomingPlayerEvent extends IncomingBaseEvent {
+    readonly type: IncomingEventType.Abort
+    readonly player: PlayerSide
+}
+
+export type IncomingEvent = IncomingIndexedEvent | IncomingSimpleEvent | IncomingPlayerEvent
 
 export enum ErrorType {
     NotValidRightNow = 'not_valid_right_now',
@@ -85,8 +90,9 @@ export enum OutgoingEventType {
 
     ScoreDice = 'score_dice',
     GainFailures = 'gain_failures',
-    SafeEndTurn = 'safe_end_turn',
-
+    PassTurn = 'pass_turn',
+    FailTurn = 'fail_turn',
+    AbandonTurn = 'abandon_turn',
     LoseRound = 'lose_round',
     LoseGame = 'lose_game',
 
@@ -121,11 +127,11 @@ export interface OutgoingBaseTargetedEvent extends OutgoingBaseEvent {
         | OutgoingEventType.LoseGame
         | OutgoingEventType.ScoreDice
         | OutgoingEventType.GainFailures
-        | OutgoingEventType.SafeEndTurn
+        | OutgoingEventType.PassTurn
         | OutgoingEventType.StartRoll
         | OutgoingEventType.StartTurn
         | OutgoingEventType.StartRound
-    readonly target: EventTarget
+    readonly target: PlayerSide
 }
 
 export interface OutgoingSimpleTargetedEvent extends OutgoingBaseTargetedEvent {
@@ -133,7 +139,7 @@ export interface OutgoingSimpleTargetedEvent extends OutgoingBaseTargetedEvent {
         | OutgoingEventType.LoseGame
         | OutgoingEventType.StartTurn
         | OutgoingEventType.StartRound
-        | OutgoingEventType.SafeEndTurn
+        | OutgoingEventType.PassTurn
 }
 
 export interface OutgoingDamageEvent extends OutgoingBaseTargetedEvent {
diff --git a/src/game/gameState.ts b/src/game/gameState.ts
index c6f4969..f55fcb8 100644
--- a/src/game/gameState.ts
+++ b/src/game/gameState.ts
@@ -44,12 +44,12 @@ export interface AIWeights {
 }
 
 export interface PlayerStartingState extends Pick<PlayerState, 'damageMax' | 'stopCount' | 'failCount'> {
-    // Percentage of damage that this player starts off dealing
-    readonly damageBonusBase: number
-    // Percentage of damage this player's damage increases by with each damage bonus earned
-    readonly damageBonusIncrement: number
+    // Percentage of damage that this player starts off dealing, default 100
+    readonly damageBonusBase?: number
+    // Percentage of damage this player's damage increases by with each damage bonus earned, default 10
+    readonly damageBonusIncrement?: number
     // Maximum number of damage bonuses that this player can have, or 0 if there's no upper limit
-    readonly maxDamageBonuses: number
+    readonly maxDamageBonuses?: number
 
     // Minimum number of dice required to stop
     readonly minStopCount: number
@@ -61,20 +61,29 @@ export interface PlayerStartingState extends Pick<PlayerState, 'damageMax' | 'st
     // Maximum number of dice required to fail
     readonly maxFailCount: number
 
-    // Base amount of damage that must be dealt to recover, or 0 if recovery is forbidden
+    // Base amount of damage that must be dealt on subsequent recoveries to recover, or 0 if recovery is forbidden
     // Defaults to 1000
     readonly recoverBase?: number
     // Amount by which the amount needed to recover increases each time recovery is earned
     // Defaults to 1000
     readonly recoverIncrement?: number
-    // Percentage of current damage taken that is removed when recovery is earned
+    // Percentage of current damage taken that is removed when recovery is earned the first time
     // Defaults to 50
-    readonly recoverPercent?: number
+    readonly recoverPercentBase?: number
+    // Percentage points to reduce recoverPercent by for each subsequent recovery
+    // Defaults to 0
+    readonly recoverPercentIncrement?: number
 
     // Instructions for if this player is an AI player. If not specified, this player cannot be played by the AI.
     readonly aiData?: AIWeights
 }
 
+export enum RoundStarter {
+    LAST_ROUND_LOSER = 'last-round-loser',
+    LAST_ROUND_WINNER = 'last-round-winner',
+    ALTERNATE = 'alternate',
+}
+
 export interface Difficulty {
     // Name of the difficulty in the select menu
     readonly name: string
@@ -84,6 +93,8 @@ export interface Difficulty {
     readonly description?: string
     // The player who should start in this difficulty; defaults to random
     readonly startingPlayer?: PlayerSide | null
+    // The player who should start a round; defaults to alternate
+    readonly roundStarter?: PlayerSide | RoundStarter
 
     // Starting values for each character
     readonly stats: {
@@ -91,14 +102,22 @@ export interface Difficulty {
     }
 }
 
+export enum PlayerTextEvent {
+    START_GAME = 'start',
+    START_ROUND = 'round',
+    ABORT_GAME = 'abort',
+    WIN_GAME = 'win',
+}
+
 export interface PlayerText {
-    // Possible random names for this player
+    // Possible random names for this player; if not given a name will not be suggested
     readonly names?: readonly string[]
 
-    // Text given at the start of the game from this side
-    readonly startText?: TriggeredText
-    // Text given at the end of the game from this side
-    readonly endText?: TriggeredText
+    readonly events?: {
+        readonly [key in ActionTextSide]?: {
+            readonly [key in PlayerTextEvent]?: RenderableText
+        }
+    }
 
     // The name of the damage value for this player
     readonly damage: string
@@ -123,7 +142,7 @@ export interface GameTheme {
 
     readonly difficulties: readonly Difficulty[]
 
-    readonly commonText?: { readonly [key: string]: RenderableText | undefined }
+    readonly commonText?: { readonly [key: string]: RenderableText }
 
     readonly narratorName: string
 
@@ -132,13 +151,22 @@ export interface GameTheme {
     }
 }
 
-export interface TriggeredText {
-    // The dialogues that can be triggered for this action.
-    // Dialogue can be disabled for characters run by human players.
-    readonly dialogue?: RenderableText
-    // The descriptions that can be triggered for this action.
-    // Descriptions are always displayed, regardless of player.
-    readonly description?: RenderableText
+export enum ActionTextEvent {
+    SELECTED = 'select',
+    PASSED = 'pass',
+    REROLLED = 'reroll',
+    ROLLED_FAIL = 'rollFail',
+    NEAR_FAILED = 'nearFail',
+    ROLLED_LAST_FAIL = 'lastFail',
+    FAILED = 'fail',
+    ABANDONED = 'abandon',
+    LOST_ROUND = 'loseRound',
+    DEFEATED = 'defeated',
+}
+
+export enum ActionTextSide {
+    SELF = 'self',
+    OPPONENT = 'opponent',
 }
 
 export interface ActionText {
@@ -149,34 +177,11 @@ export interface ActionText {
     // Description of the action when selected for this side
     readonly description: string
 
-    // Text given when this side selects this action.
-    readonly selectAction?: TriggeredText
-    // Text given when the other side selects this action.
-    readonly opponentSelectsAction?: TriggeredText
-    // Text given when this side finishes a turn in this action without failing.
-    readonly passTurn?: TriggeredText
-    // Text given when this side receives a turn from the opponent in this action.
-    readonly opponentPassesTurn?: TriggeredText
-    // Text given when this side rerolls the dice for this action.
-    readonly reroll?: TriggeredText
-    // Text given when the opposing side rerolls the dice for this action.
-    readonly opponentRerolls?: TriggeredText
-    // Text given the first time each turn this side is one fail die away from failing
-    readonly aboutToFailTurn?: TriggeredText
-    // Text given the first time each turn the opposing side is one fail die away from failing
-    readonly opponentAboutToFailTurn?: TriggeredText
-    // Text given when this side fails the turn by accumulating fail dice
-    readonly failTurn?: TriggeredText
-    // Text given when the opposing side fails the turn by accumulating fail dice
-    readonly opponentFailsTurn?: TriggeredText
-    // Text given when this side fails the turn by stopping without enough points
-    readonly abandonTurn?: TriggeredText
-    // Text given when the opposing side fails the turn by stopping without enough points
-    readonly opponentAbandonsTurn?: TriggeredText
-    // Text given when this side is defeated by being pushed over their max damage with this action
-    readonly defeated?: TriggeredText
-    // Text given when this side defeats the opponent by pushing them over their max damage with this action
-    readonly opponentDefeated?: TriggeredText
+    readonly text: {
+        [side in ActionTextSide]?: {
+            [event in ActionTextEvent]?: RenderableText
+        }
+    }
 }
 
 export interface GameAction {
@@ -188,15 +193,13 @@ export interface GameAction {
     // The dice that are rolled for this action
     readonly dice: readonly DieType[]
     // True if the loser of this action increases the amount of damage they take
-    readonly givesDamageBonus: boolean
+    readonly givesDamageBonus?: boolean
     // True if the loser of this action has to get an additional stop die to end their turn
-    readonly givesStopCount: boolean
+    readonly givesStopCount?: boolean
     // True if the loser of this action has one fewer buffer for fail dice
-    readonly givesFailCount: boolean
-    // Whether this action can end the game in a loss for the top
-    readonly canFinishTop: boolean
-    // Whether this action can end the game in a loss for the bottom
-    readonly canFinishBottom: boolean
+    readonly givesFailCount?: boolean
+    // Whether this action can end the game in a loss for the loser of this action
+    readonly canFinish?: boolean
 }
 
 export enum PlayerSide {
@@ -204,6 +207,15 @@ export enum PlayerSide {
     BOTTOM = 'bottom',
 }
 
+export function oppositePlayer(side: PlayerSide): PlayerSide {
+    switch (side) {
+        case PlayerSide.BOTTOM:
+            return PlayerSide.TOP
+        case PlayerSide.TOP:
+            return PlayerSide.BOTTOM
+    }
+}
+
 export interface PlayerState {
     // This player's name
     readonly name: string
@@ -246,8 +258,10 @@ export interface GameState {
 
     // The current phase of the game.
     readonly gamePhase: GamePhase
-    // The owner of the current phase, or null if the phase is Aborted
-    readonly phaseOwner: PlayerSide | null
+    // The owner of the current phase
+    readonly phaseOwner: PlayerSide
+    // The initiator of the current round
+    readonly roundOwner: PlayerSide
 
     // The state of each player in the game.
     readonly players: {
@@ -265,8 +279,8 @@ export interface GameState {
     readonly lastRoll: readonly DieResult[]
     // The total value of the selected dice, or 0 if the selected dice cannot be scored.
     readonly selectedDiceValue: number
-    // Whether the selected dice are sufficient to end the turn.
-    readonly selectedDiceEndTurn: boolean
+    // Whether the current dice are sufficient to end the turn.
+    readonly currentDiceEndTurn: boolean
     // The number of dice that have come up failures so far in the current turn, including the lastRoll.
     readonly countedFails: number
     // The total of the dice that have been scored so far this turn
diff --git a/src/game/handleEvent.ts b/src/game/handleEvent.ts
index 49b8206..f93220a 100644
--- a/src/game/handleEvent.ts
+++ b/src/game/handleEvent.ts
@@ -1,7 +1,24 @@
-import { ErrorType, EventResult, IncomingEvent, IncomingEventType } from './gameEvent'
-import { GamePhase, GameState } from './gameState'
-import { DieResult, DieState, isSelectedState, setDeselected, setSelected, toggleSelected } from './dieState'
+import { ErrorType, EventResult, IncomingEvent, IncomingEventType, OutgoingEventType } from './gameEvent'
+import { GamePhase, GameState, oppositePlayer, PlayerSide, PlayerState, RoundStarter } from './gameState'
+import {
+    DieFace,
+    DieResult,
+    DieState,
+    DieType,
+    isSelectedState,
+    setDeselected,
+    setSelected,
+    toggleSelected,
+} from './dieState'
 import { isValidIndex } from '../util/precondition'
+import {
+    calculateBonuses,
+    calculateDamage,
+    calculateFails,
+    calculateRecovery,
+    calculateStops,
+    determineNextRoundStarter,
+} from './calculateDamage'
 
 export function handleEvent(state: GameState, event: IncomingEvent): EventResult<GameState> {
     try {
@@ -18,8 +35,10 @@ export function handleEvent(state: GameState, event: IncomingEvent): EventResult
                 return handleHoldDiceEvent<DieResult, GameState>(state, true)
             case IncomingEventType.ReleaseSelectedDice:
                 return handleHoldDiceEvent<DieResult, GameState>(state, false)
+            case IncomingEventType.EndTurn:
+                return handleEndTurnEvent<PlayerState, GameState>(state)
             case IncomingEventType.Abort:
-                return handleAbortEvent<GameState>(state)
+                return handleAbortEvent<GameState>(state, event)
             default:
                 return {
                     newState: state,
@@ -178,7 +197,156 @@ function handleHoldDiceEvent<D extends { readonly state: DieState }, T extends D
     }
 }
 
-function handleAbortEvent<T extends { readonly gamePhase: GamePhase }>(state: T): EventResult<T> {
+export interface EndTurnPlayer {
+    readonly damage: number
+    readonly damageMax: number
+    readonly damageTotal: number
+    readonly stopCount: number
+    readonly failCount: number
+    readonly damageBonuses: number
+    readonly nextRecoverAt: number
+    readonly timesRecovered: number
+}
+
+export interface EndTurnState<P extends EndTurnPlayer> {
+    readonly difficulty: {
+        readonly roundStarter?: PlayerSide | RoundStarter
+        readonly stats: {
+            [key in PlayerSide]: {
+                readonly maxDamageBonuses?: number
+                readonly minFailCount?: number
+                readonly maxStopCount?: number
+                readonly damageBonusBase?: number
+                readonly damageBonusIncrement?: number
+                readonly recoverBase?: number
+                readonly recoverIncrement?: number
+                readonly recoverPercentBase?: number
+                readonly recoverPercentIncrement?: number
+            }
+        }
+    }
+    readonly gamePhase: GamePhase
+    readonly phaseOwner: PlayerSide
+    readonly roundOwner: PlayerSide
+    readonly action: {
+        readonly dice: readonly DieType[]
+        readonly givesDamageBonus?: boolean
+        readonly givesStopCount?: boolean
+        readonly givesFailCount?: boolean
+        readonly canFinish?: boolean
+    }
+    readonly players: {
+        readonly [key in PlayerSide]: P
+    }
+    readonly lastRoll: readonly { readonly face: DieFace }[]
+    readonly lastTurnTotal: number
+    readonly currentTurnTotal: number
+    readonly selectedDiceValue: number
+    readonly currentDiceEndTurn: boolean
+    readonly countedFails: number
+}
+
+function handleEndTurnEvent<P extends EndTurnPlayer, T extends EndTurnState<P>>(state: T): EventResult<T> {
+    if (state.gamePhase !== GamePhase.TURN_ROLLED && state.gamePhase !== GamePhase.TURN_FAILED) {
+        return {
+            error: {
+                type: ErrorType.NotValidRightNow,
+                message: `You can only end your turn when it's in progress.`,
+            },
+            newState: state,
+        }
+    }
+    const failed = state.gamePhase === GamePhase.TURN_FAILED || !state.currentDiceEndTurn
+    const delta = state.lastTurnTotal - (failed ? 0 : state.currentTurnTotal)
+    if (delta < 0) {
+        // The winner of this round has not yet been decided; this is better than the last turn this round.
+        // Moving on to the next turn...
+        return {
+            newState: {
+                ...state,
+                lastTurnTotal: state.currentTurnTotal,
+                currentTurnTotal: 0,
+                selectedDiceValue: 0,
+
+                lastRoll: [],
+                phaseOwner: oppositePlayer(state.phaseOwner),
+            },
+            events: [
+                {
+                    type: OutgoingEventType.PassTurn,
+                    target: state.phaseOwner,
+                },
+                {
+                    type: OutgoingEventType.StartTurn,
+                    target: oppositePlayer(state.phaseOwner),
+                },
+            ],
+        }
+    } else {
+        // That's the round.
+        // Time to calculate your punishment.
+        const player = state.players[state.phaseOwner]
+        const opponent = state.players[oppositePlayer(state.phaseOwner)]
+        const stats = state.difficulty.stats[state.phaseOwner]
+        const damageDelta = calculateDamage(delta, player, stats)
+        const newDamage = player.damage + damageDelta
+        const newTotal = player.damageTotal + damageDelta
+        const stops = state.action.givesStopCount ? calculateStops(player, stats) : player.stopCount
+        const fails = state.action.givesFailCount ? calculateFails(player, stats) : player.failCount
+        const bonuses = state.action.givesDamageBonus ? calculateBonuses(player, stats) : player.damageBonuses
+        const opponentDamage = calculateRecovery(
+            player,
+            opponent,
+            state.difficulty.stats[oppositePlayer(state.phaseOwner)],
+        )
+        const playerResult: P = {
+            ...player,
+            damage: newDamage,
+            damageTotal: newTotal,
+            stopCount: stops,
+            failCount: fails,
+            damageBonuses: bonuses,
+        }
+        const opponentResult: P = {
+            ...player,
+            damage: opponentDamage,
+        }
+        const players =
+            state.phaseOwner === PlayerSide.TOP
+                ? { top: playerResult, bottom: opponentResult }
+                : { top: opponentResult, bottom: playerResult }
+        // Oh, no... That's game over for you, my friend...
+        const newPhase =
+            state.action.canFinish && playerResult.damage >= playerResult.damageMax
+                ? GamePhase.VICTORY
+                : GamePhase.ROUND_START
+        const newRoundOwner =
+            newPhase === GamePhase.VICTORY
+                ? oppositePlayer(state.phaseOwner)
+                : determineNextRoundStarter(state, state.difficulty)
+        return {
+            newState: {
+                ...state,
+                players,
+                currentDiceEndTurn: false,
+                gamePhase: newPhase,
+                phaseOwner: newRoundOwner,
+                roundOwner: newRoundOwner,
+                lastRoll: [],
+                currentTurnTotal: 0,
+                lastTurnTotal: 0,
+                countedFails: 0,
+                selectedDiceValue: 0,
+            },
+            events: [],
+        }
+    }
+}
+
+function handleAbortEvent<T extends { readonly gamePhase: GamePhase; readonly phaseOwner: PlayerSide }>(
+    state: T,
+    { player }: { readonly player: PlayerSide },
+): EventResult<T> {
     if (state.gamePhase === GamePhase.ABORTED || state.gamePhase === GamePhase.VICTORY) {
         return {
             error: {
@@ -192,6 +360,7 @@ function handleAbortEvent<T extends { readonly gamePhase: GamePhase }>(state: T)
         newState: {
             ...state,
             gamePhase: GamePhase.ABORTED,
+            phaseOwner: player ?? state.phaseOwner,
         },
         events: [],
     }