Heaven's Cloud is obtained in 1.35 by Morping Variablis in Extra Battle.
Ah I already try this fight. Can't do anything my characters spend them time control by the boss.
Edit: Well, he's dead, now i will uset he power of exel to try to morph it
Edit 2: After 6 fight, he NEVER get the same hp max. Sometime more, sometime less.
(exemple: max hp 38556- 46578- 41151-)
Did you REALLY have put random hp on a boss we need to morph ? Really ? ........... I have to find you now
Edit3: Confirmed, he has random hp. Segachief you are satan