Mehh. Not as impressive as I hoped it to be.
In a game where drop kick higher than 1 mil has been achieved, I feel like this could go higher than what's shown here.
Drop Kick max damage output is largely irrelevant when you require Support Shot assistance and combo card usage in order to deal said damage to a single target.
Hydra Transmutation deals heavy residual damage and debuffs several targets, pierces defenses, and doesn't wake sleeping targets. It has great synergy with everything and further trivializes the meta-game. Sheer damage values alone are not an all-encompassing indication of usefulness.
This skill is absolutely lethal and I would hope that you wouldn't expect for it to deal greater damage than it deals at present.
It's about time DevCat pushed out new content, buffed enemies, provided new difficulties, and buffed things that need improvement...like Mana Crystalization/Blacksmithing/Encore/etc.