I only heard the appearance of this boss in Pioneer reports as this boss no longer exist after it was killed. Basically, it is a one-time boss. Once killed, it will no longer spawn anything related to it. And that is the problem.
Because there is no existing guide of it in the past timeline since it was defeated and the point of putting up a guide online is no longer useful since no players will be able to fight against it anymore, I don't know any of its attack patterns, gimmicks and other abilities it has currently stored.
In short, I have to formulate my own playstyle on this one. going in blind on this one.
"SCATTER EVERYONE!"
BANG!
The huge tentacle of the Ice Devilfish landed at our location and immediately landed at the location of the ice. Not only that but spikes of ice pillars appeared the moment its tentacles landed on the ground.