>>96076294Iliira was out of the campaign at that point no matter what because none of the PCs (party was Thief, Undying Warlock/Way of Shadows Monk, Hunter Ranger, and Great Old One Warlock) had reliable plane-traveling powers, and were all too busy dealing with the Cult to waste time on tracking down Iliira's corpse in the Astral anyway. For the rest of the campaign I played Sir Isteval.
The coward PC (the warlock/monk) had been a bitch in general through most of the campaign, and in particular her player said that she was "leaving the drow and paladin to die", not running for backup or to warn the others or anything. So the DM shifted her alignment from Neutral to Neutral Evil. This being 5e and being a monk/warlock the change was mostly cosmetic.
I was actually really happy with the end. Saving the party from a dragon by sacrificing herself was a pretty badass way for Iliira to go out, I thought. It's the kind of thing that stories are told about, and it'd probably result in her being known up and down the Sword Coast as a hero, and not just as "the drow". Her main goal in life was to be known for more than her race.
For shits n' giggles, at the end of the session after the other PCs dealt with other stuff (and Sir Isteval told everyone what happened with Iliira), the DM and I RP'd out the fight in the Astral between Iliira and the ancient white dragon.
Between increased movement speed (thanks to high INT), a Silver Horn of Valhalla for backup barbarians (thereby allowing Sneak Attack), the Lucky feat, just being lucky in general, and the DM just being unable to recharge the dragon's breath weapon...Iliira WON. Still out of the campaign and believed to be dead, though.
How she escaped the Astral is a story for another time.