FYI to all you Archangel Lucifer owners. It turns out you can't use his active skill if you're already at 1HP. Which means you can't use both leaders' skills on the same turn, unless you somehow heal to more than 1HP on the same turn. I tested this out by bringing along Ceres with my dual Angel Lucifer team into the Endless Corridors. Once I had both Lucifers charged, I used one to kill off an enemy. In doing so, my HP drops to 1. I immediately attempt to use the other Lucifer's skill, but the game won't let me. I activate Ceres' skill to refill my HP, and then I was able to use the other Lucifer's skill.
This threw a wrench into my plan to build a Lucifer/Lucifer/Hades/Hades/Hera/Lucifer team that theoretically could 1-turn kill Zeus in his Descended dungeon. But it assumed I could activate all 3 Gravities and all 3 Lucifers on the same turn.
Sent you an invite, but due to the large difference between our ranks, the window of time that my monster will be available to use as a helper will be short. I think it's only 1hr.