Armala, the Widow became invulnerable in 2nd phase.

https://imgur.com/a/rhTeD3W

Was dealing damage fine before her first disappearance.

Bug report 3089489170

Went from about 75% health to full health.

No fragments attempted, if that matters.

Edit #1

Maven was supposed to be witnessing, but wasn't.
(I'm 95% sure, I've been grinding the invite)

2 voidstones. Sextant mods:
-Players and Monsters take 12% increased Chaos damage
-Players and Monsters take 12% increased Phys damage

Last used charge on both, maybe both were used up without knowing before opening the map instance.

Edit #2

No league mechanic used to empower