User blog comment:Linathan/Squad Spotlight & Guide: Trial EX7 - Rainbow Goddess/@comment-26331700-20160803050023

Turn 1 if a UBB is used during Phase 1  or  if a UBB is used before HP < 50% 
 * World Bathed in Light - Apocalyptic Light attack that deals 500% of HP as damage on all foes & removes all buffs
 * I hope you didn’t use UBB during Phase 1.



Actually, you can use ubb in phase 1, just make sure the barrier and 87.5% is up.

https://www.youtube.com/watch?v=JgcQGPaOvLc