I've gotten echo of lilith down to a sliver of health 4 times. The last time i got her there i was whomping on her her and she was not dying.

is this normal? does she have to go through all of the stages in her second phase in order to die?

It might be a bug, this has happened to me a 2 times in a row. When she gets to that point she cannot die. Third time had no issue

she will stay with 1 health and has to do the transformation and floor breaking phases, yes

she stayes at 1 health till we leave or all die. there is no way she stays like that for 4-5 mins

crajppy boss design

yeah idk I think if you die and run back and spawn her in too fast sometimes it glitches out and she just sits at 1hp first phase, happened to me a few times.

Well I did that about 50 times over the course of 4 hours so if going back in too quickly is causing the bug then

Not sure if they fixed this, but you’d used to have to make sure you let her hit each of the HP thresholds to trigger her flight up without bursting her too quickly. It would bug out on me and repeat waves over and over.

However to anyone out there reading this who hasn’t done Uber Lilith: this boss fight is a waste of your time and I do not recommend it.