isleward/src/server/config/spells/spellCocoon.js

module.exports = {
	type: 'cocoon',

	cdMax: 7,
	manaCost: 0,

	range: 9,

	speed: 200,
	damage: 0,

	needLos: true,

	ttl: 75,

	cast: function (action) {
		let obj = this.obj;
		let target = action.target;

		let ttl = Math.sqrt(Math.pow(target.x - obj.x, 2) + Math.pow(target.y - obj.y, 2)) * this.speed;

		this.sendAnimation({
			caster: this.obj.id,
			components: [{
				idSource: this.obj.id,
				idTarget: target.id,
				type: 'projectile',
				ttl: ttl,
				particles: this.particles
			}, {
				type: 'attackAnimation',
				layer: 'projectiles',
				loop: -1,
				row: this.row,
				col: this.col
			}]
		});

		this.sendBump(target);

		this.queueCallback(this.explode.bind(this, target), ttl);

		return true;
	},
	explode: function (target) {
		if (this.obj.destroyed)
			return;

		target.effects.addEffect({
			type: 'cocoon',
			ttl: this.ttl,
			source: this.obj
		});

		this.obj.instance.syncer.queue('onGetDamage', {
			id: target.id,
			event: true,
			text: 'cocooned'
		}, -1);

		target.aggro.tryEngage(this.obj, this.damage, this.threatMult);
	}
};