Secret Timer on Clockheart?
I cannot confirm whether this is true or not, but I certainly experienced something similar today.
The group was doing fine surviving his 30 charge ground pound ability when it got to that, but after about ten minutes of fighting he again did the ground pound ability that downed everyone in the party in one wave.
Definitely felt like some frenzy timer had kicked in.
I got this today as well. Same as his super attack but covered the entire room. Killed me from the complete opposite side while i was grabbing a holo. Although we were only in the fight for not even 5 minutes. Perhaps it is a low health triggered attack?
the room becomes more and more electrified if you can’t avoid his super attack during ilvulnerability phases and use a hologram to disarm his shield. Also while you “can” attack him, get directly under him so that the room is not littered with those kitten annoying clock mine thingies. Hope it helps..