How about arcbolt grenade? It can kill 5 enemies within 2 seconds. I don't use YAS but I do have Ashes to Assets. My entire armour build is built around that perk. I have Lucky Raspberry, gloves with a perk that allows fast melee speed and grenade restore on melee hit. And blink strike fast twitch, full intellect half discipline half strength. All they had to fu[i][/i]cking do is make it not stack, and make it not activate on hit. That's it, no ridiculously long cool down.