diff --git a/src/plugin/boss/barrage.ts b/src/plugin/boss/barrage.ts
index df0ea4a..02e6f56 100644
--- a/src/plugin/boss/barrage.ts
+++ b/src/plugin/boss/barrage.ts
@@ -17,8 +17,11 @@ export abstract class BarrageBoss extends EventEmitter<BarrageBossEvent> {
 
     /** 开始时刻 */
     private startTime: number = 0;
+
     /** 当前帧数 */
     frame: number = 0;
+    /** 上一帧的时刻 */
+    lastTime: number = 0;
 
     /** 这个boss战的主渲染元素，所有弹幕都会在此之上渲染 */
     abstract readonly main: BossSprite;
@@ -31,17 +34,19 @@ export abstract class BarrageBoss extends EventEmitter<BarrageBossEvent> {
      * boss的ai，战斗开始后，每帧执行一次
      * @param time 从战斗开始算起至现在经过了多长时间
      * @param frame 从战斗开始算起至现在经过了多少帧，即当前是第几帧
+     * @param dt 本帧距上一帧多长时间，即上一帧持续了多长时间
      */
-    abstract ai(time: number, frame: number): void;
+    abstract ai(time: number, frame: number, dt: number): void;
 
     private tick = () => {
         const now = Date.now();
-        this.ai(now - this.startTime, this.frame);
+        const dt = now - this.lastTime;
+        this.ai(now - this.startTime, this.frame, dt);
         this.frame++;
         this.projectiles.forEach(v => {
             const time = now - v.startTime;
             v.time = time;
-            v.ai(this, time, v.frame);
+            v.ai(this, time, v.frame, dt);
             v.frame++;
             if (time > 60_000) {
                 this.destroyProjectile(v);
@@ -50,6 +55,7 @@ export abstract class BarrageBoss extends EventEmitter<BarrageBossEvent> {
                 v.doDamage(this.state);
             }
         });
+        this.lastTime = now;
     };
 
     /**
@@ -230,8 +236,9 @@ export abstract class Projectile<T extends BarrageBoss = BarrageBoss> {
      * @param boss 从属的boss
      * @param time 从弹幕生成开始算起至现在经过了多长时间
      * @param frame 从弹幕生成开始算起至现在经过了多少帧，即当前是第几帧
+     * @param dt 本帧距上一帧多长时间，即上一帧持续了多长时间
      */
-    abstract ai(boss: T, time: number, frame: number): void;
+    abstract ai(boss: T, time: number, frame: number, dt: number): void;
 
     /**
      * 这个弹幕的渲染函数，原则上一个boss的弹幕应该全部画在同一层，而且渲染前画布不进行矩阵变换
diff --git a/src/plugin/boss/palaceBoss.ts b/src/plugin/boss/palaceBoss.ts
new file mode 100644
index 0000000..013f415
--- /dev/null
+++ b/src/plugin/boss/palaceBoss.ts
@@ -0,0 +1,131 @@
+import { IStateDamageable } from '@/game/state/interface';
+import { BarrageBoss, BossSprite, Hitbox } from './barrage';
+import { MotaOffscreenCanvas2D } from '@/core/fx/canvas2d';
+import {
+    Container,
+    HeroRenderer,
+    LayerGroup,
+    MotaRenderer,
+    RenderItem,
+    Shader,
+    Transform
+} from '@/core/render';
+import { Pop } from '../fx/pop';
+import { SplittableBall } from './palaceBossProjectile';
+import { PointEffect } from '../fx/pointShader';
+
+Mota.require('var', 'loading').once('coreInit', () => {
+    const shader = new Shader();
+    shader.size(480, 480);
+    shader.setHD(true);
+    shader.setZIndex(120);
+    PalaceBoss.shader = shader;
+    PalaceBoss.effect.create(shader, 40);
+});
+
+const enum BossStage {
+    Prologue,
+
+    Stage1,
+    Stage2,
+    Stage3,
+    Stage4,
+
+    End
+}
+
+export class PalaceBoss extends BarrageBoss {
+    static effect: PointEffect = new PointEffect();
+    static shader: Shader;
+
+    main: BossSprite<BarrageBoss>;
+    hitbox: Hitbox.Circle;
+    state: IStateDamageable;
+
+    private stage: BossStage = BossStage.Prologue;
+
+    /** 用于展示傅里叶频谱的背景元素 */
+    private back: SonicBack;
+    /** 楼层渲染元素 */
+    private group: LayerGroup;
+    /** 楼层渲染容器 */
+    private mapDraw: Container;
+    /** 伤害弹出 */
+    pop: Pop;
+
+    private heroHp: number = 0;
+
+    constructor() {
+        super();
+
+        const render = MotaRenderer.get('render-main')!;
+        this.group = render.getElementById('layer-main') as LayerGroup;
+        this.mapDraw = render.getElementById('map-draw') as Container;
+        this.pop = render.getElementById('pop-main') as Pop;
+
+        this.state = core.status.hero;
+        this.main = new BossEffect('static', this);
+        this.back = new SonicBack('static');
+        const { x, y } = core.status.hero.loc;
+        const cell = 32;
+        this.hitbox = new Hitbox.Circle(x + cell / 2, y + cell / 2, cell / 3);
+    }
+
+    override start(): void {
+        super.start();
+
+        PalaceBoss.shader.append(this.mapDraw);
+        this.main.append(this.group);
+
+        // const event = this.group.getLayer('event');
+        // const hero = event?.getExtends('floor-hero') as HeroRenderer;
+        // hero?.on('moveTick', this.moveTick);
+
+        SplittableBall.init({});
+        this.heroHp = core.status.hero.hp;
+    }
+
+    override end(): void {
+        super.end();
+
+        PalaceBoss.shader.remove();
+        this.main.remove();
+        this.back.remove();
+        this.main.destroy();
+        this.back.destroy();
+
+        // const event = this.group.getLayer('event');
+        // const hero = event?.getExtends('floor-hero') as HeroRenderer;
+        // hero?.off('moveTick', this.moveTick);
+
+        SplittableBall.end();
+
+        PalaceBoss.effect.end();
+        core.status.hero.hp = this.heroHp;
+
+        Mota.Plugin.require('replay_g').clip('choices:0');
+    }
+
+    ai(time: number, frame: number): void {}
+}
+
+class BossEffect extends BossSprite<PalaceBoss> {
+    protected preDraw(
+        canvas: MotaOffscreenCanvas2D,
+        transform: Transform
+    ): boolean {
+        return true;
+    }
+
+    protected postDraw(
+        canvas: MotaOffscreenCanvas2D,
+        transform: Transform
+    ): void {}
+}
+
+class SonicBack extends RenderItem {
+    protected render(
+        canvas: MotaOffscreenCanvas2D,
+        transform: Transform
+    ): void {}
+}
diff --git a/src/plugin/boss/palaceBossProjectile.ts b/src/plugin/boss/palaceBossProjectile.ts
new file mode 100644
index 0000000..bb962ce
--- /dev/null
+++ b/src/plugin/boss/palaceBossProjectile.ts
@@ -0,0 +1,261 @@
+import { MotaOffscreenCanvas2D } from '@/core/fx/canvas2d';
+import { Transform } from '@/core/render';
+import { IStateDamageable } from '@/game/state/interface';
+import { Hitbox, Projectile } from './barrage';
+import type { PalaceBoss } from './palaceBoss';
+import { clamp } from '../utils';
+
+function popDamage(damage: number, boss: PalaceBoss, color: string) {
+    const { x, y } = core.status.hero.loc;
+    boss.pop.addPop(
+        (-damage).toString(),
+        1000,
+        x * 32 + 16,
+        y * 32 + 16,
+        color
+    );
+}
+
+export interface ISplitData {
+    split: boolean;
+    /** 分裂时刻，以弹幕被创建时刻为基准 */
+    time: number;
+    /** 分裂起始角度，以该弹幕朝向方向为 0 */
+    startAngle: number;
+    /** 分裂终止角度，以该弹幕朝向方向为 0 */
+    endAngle: number;
+    /** 每秒加速度 */
+    acc: number;
+    /** 初始速度 */
+    startVel: number;
+    /** 终止速度 */
+    endVel: number;
+    /** 持续时长 */
+    lastTime: number;
+    /** 分裂数量 */
+    count: number;
+    /** 这个弹幕分裂产生的弹幕的分裂信息，不填则表示产生的弹幕不会分裂 */
+    data?: ISplitData;
+}
+
+export class SplittableBall extends Projectile<PalaceBoss> {
+    damage: number = 10000;
+    hitbox: Hitbox.Circle = new Hitbox.Circle(0, 0, 8);
+
+    static ball: Map<string, MotaOffscreenCanvas2D> = new Map();
+
+    private damaged: boolean = false;
+    private splitData?: ISplitData;
+    private last: number = 60_000;
+
+    /** 角度，水平向右为 0，顺时针旋转一圈为 Math.PI * 2 */
+    private angle: number = 0;
+    /** 每秒加速度 */
+    private acc: number = 0;
+    /** 初始速度，每秒多少像素 */
+    private startVel: number = 0;
+    /** 终止速度 */
+    private endVel: number = 0;
+    /** 弹幕颜色 */
+    private color?: string;
+
+    private startVelX: number = 0;
+    private startVelY: number = 0;
+    private endVelX: number = 0;
+    private endVelY: number = 0;
+    private vx: number = 0;
+    private vy: number = 0;
+    // 加速度
+    private ax: number = 0;
+    private ay: number = 0;
+
+    static init(colors: Record<string, string[]>) {
+        this.ball.clear();
+        for (const [key, color] of Object.entries(colors)) {
+            const canvas = new MotaOffscreenCanvas2D();
+            canvas.size(32, 32);
+            canvas.withGameScale(true);
+            canvas.setHD(true);
+            const ctx = canvas.ctx;
+            const gradient = ctx.createRadialGradient(16, 16, 8, 16, 16, 16);
+            const step = 1 / (color.length - 1);
+            for (let i = 0; i < color.length; i++) {
+                gradient.addColorStop(i * step, color[i]);
+            }
+            ctx.fillStyle = gradient;
+            ctx.arc(16, 16, 16, 0, Math.PI * 2);
+            ctx.fill();
+            canvas.freeze();
+            this.ball.set(key, canvas);
+        }
+    }
+
+    static end() {
+        this.ball.forEach(v => {
+            v.clear();
+            v.delete();
+        });
+        this.ball.clear();
+    }
+
+    /**
+     * 设置持续时长
+     * @param time 持续时长
+     */
+    setLastTime(time: number) {
+        this.last = time;
+    }
+
+    /**
+     * 设置这个弹幕的分裂数据
+     * @param data 分裂数据，不填表示该弹幕不会分裂
+     */
+    setSplitData(data?: ISplitData) {
+        this.splitData = data;
+    }
+
+    /**
+     * 计算速度分量信息
+     */
+    private calVel() {
+        const sin = Math.sin(this.angle);
+        const cos = Math.cos(this.angle);
+        const vel = Math.hypot(this.vx, this.vy);
+
+        this.startVelX = this.startVel * cos;
+        this.startVelY = this.startVel * sin;
+        this.endVelX = this.endVel * cos;
+        this.endVelY = this.endVel * sin;
+        this.ax = this.acc * cos;
+        this.ay = this.acc * sin;
+        this.vx = vel * cos;
+        this.vy = vel * sin;
+    }
+
+    /**
+     * 设置弹幕速度朝向
+     * @param angle 朝向
+     */
+    setAngle(angle: number) {
+        this.angle = angle;
+        this.calVel();
+    }
+
+    /**
+     * 设置速度
+     * @param start 起始速度
+     * @param end 终止速度
+     */
+    setVel(start: number, end: number) {
+        this.startVel = start;
+        this.endVel = end;
+        this.calVel();
+    }
+
+    /**
+     * 设置加速度
+     * @param acc 加速度，每秒加速多少像素
+     */
+    setAcc(acc: number) {
+        this.acc = acc;
+        this.calVel();
+    }
+
+    /**
+     * 设置弹幕的颜色
+     * @param color 颜色
+     */
+    setColor(color: string) {
+        this.color = color;
+    }
+
+    isIntersect(hitbox: Hitbox.HitboxType): boolean {
+        if (hitbox instanceof Hitbox.Circle) {
+            return Hitbox.checkCircleCircle(hitbox, this.hitbox);
+        } else {
+            return false;
+        }
+    }
+
+    updateHitbox(x: number, y: number): void {
+        this.hitbox.setCenter(x, y);
+    }
+
+    doDamage(target: IStateDamageable): boolean {
+        if (this.damaged) return false;
+        target.hp -= this.damage;
+        this.damaged = true;
+        core.drawHeroAnimate('hand');
+        popDamage(this.damage, this.boss, '#ff8180');
+        return true;
+    }
+
+    private split(boss: PalaceBoss) {
+        if (!this.splitData?.split) return;
+        const {
+            startAngle,
+            endAngle,
+            startVel,
+            endVel,
+            acc,
+            lastTime,
+            count,
+            data
+        } = this.splitData;
+
+        const sa = this.angle + startAngle;
+        const ea = this.angle + endAngle;
+        const step = (ea - sa - 1) / count;
+        const { x, y } = this.hitbox;
+
+        for (let i = 0; i < count; i++) {
+            const proj = boss.createProjectile(SplittableBall, x, y);
+            proj.setAngle(sa + step * i);
+            proj.setAcc(acc);
+            proj.setVel(startVel, endVel);
+            proj.setLastTime(lastTime);
+            proj.setSplitData(data);
+        }
+    }
+
+    ai(boss: PalaceBoss, time: number, frame: number, dt: number): void {
+        if (this.splitData?.split) {
+            if (time > this.splitData.time) {
+                this.split(boss);
+            }
+        }
+        if (time > this.last) {
+            this.destroy();
+            return;
+        }
+        const p = dt / 1000;
+        this.vx += this.ax * p;
+        this.vy += this.ay * p;
+
+        const sx = Math.sign(this.vx);
+        const sy = Math.sign(this.vy);
+        const cx = clamp(
+            Math.abs(this.vx),
+            Math.abs(this.startVelX),
+            Math.abs(this.endVelX)
+        );
+        const cy = clamp(
+            Math.abs(this.vy),
+            Math.abs(this.startVelY),
+            Math.abs(this.endVelY)
+        );
+        this.vx = cx * sx;
+        this.vy = cy * sy;
+
+        const { x, y } = this.hitbox;
+        this.setPosition(x + this.vx * p, y + this.vy * p);
+    }
+
+    render(canvas: MotaOffscreenCanvas2D, transform: Transform): void {
+        if (!this.color) return;
+        const texture = SplittableBall.ball.get(this.color);
+        if (!texture) return;
+        const ctx = canvas.ctx;
+        ctx.drawImage(texture.canvas, this.x - 16, this.y - 16, 32, 32);
+    }
+}
diff --git a/src/plugin/boss/towerBoss.ts b/src/plugin/boss/towerBoss.ts
index d8ba539..13d7c9f 100644
--- a/src/plugin/boss/towerBoss.ts
+++ b/src/plugin/boss/towerBoss.ts
@@ -179,6 +179,8 @@ export class TowerBoss extends BarrageBoss {
         this.healthBar.remove();
         this.word.remove();
         this.main.remove();
+        this.main.destroy();
+        this.healthBar.destroy();
 
         const event = this.group.getLayer('event');
         const hero = event?.getExtends('floor-hero') as HeroRenderer;