Guess it can't harm to finally have the skill written down somewhere.
CP cost: 300
Charge time: 1.5s
Cd: 15 min
ATK: 3691-5506 Ch-ATK: 3234-5274 (numbers may vary)
Debuff: Instant SP -400
Well, to be honest, not the greatest skill with a long cooldown and fairly long charge time (as all ultis I got seem to have), and only single target.
Make sure to stun and disable your target before using the skill.
Also, it is not one hit but many quick ones, so the damage on a high def and/or high void target is much much lower since every small hits' damage is reduced.
Worth the 30k ... no. Buuut ... I'd take it again and again, because it's fun and somehow completes your character.