Panopt's Vaskania (Monstrosity)

I recently hit level 30 as my Panopt and I unlocked the ability Vaskania. However, I cannot get it working no matter how I try. I've tried it at night, at 300 TP (you only need 100 TP), with the Panopt Instinct I equipped, and on Darksday (it's a dark type attack, I figured it wouldn't hurt to try). I can't get it working. I haven't had this issue with any other monster or any other Panopt ability. Only Vaskania the level 30 Panopt attack. So I'm wondering if this is indeed a bug. I was really excited about trying it out. :(