Entity_Wither: {
    type: "compound";
    value: {
        AirAttack: { type: "byte"; value: number };
        dyingFrames: { type: "int"; value: number };
        firerate: { type: "int"; value: number };
        Invul: { type: "int"; value: number };
        lastHealthInterval: { type: "int"; value: number };
        maxHealth: { type: "int"; value: number };
        oldSwellAmount: { type: "float"; value: number };
        overlayAlpha: { type: "float"; value: number };
        Phase: { type: "int"; value: number };
        ShieldHealth: { type: "int"; value: number };
        SpawningFrames: { type: "int"; value: number };
        swellAmount: { type: "float"; value: number };
    };
} & ActorPrefix

Additional fields for wither.