She started off as an experiment in obtaining Lichform, so I could plan out a proper run at High Peak. Instead, she was my fourth win, first win post-1.0, and the most deaths of any winner I have had. I really had no idea how to take out Celia without minions at level 23, so I died quite a lot. In retrospect, abuse teleports to get the bad guys spread out, and snipe them one-by-one. The same plan would have served me well in the final fight, as I decided to tank both and try to take down Argoniel first. I wish I had made the opposite choice, but after dying a couple times without achieving anything I finally got the pair of them separated long enough to take out Argoniel.
I really wanted the Crown of Eternal Night, but I had no luck with that. I never found a particularly good hat. I did loot the randart boots from a chest before Dreadfell so I guess I spent all my luck on those. I wish I had pumped my spellpower more.
Possible bugs:
When I had Lichform on, I also had Blurred Mortality on. The orc blood mage who killed me wound up with two entries in my deaths list. An inanimate clone version of me spawned underneath me when I came back. I did not try to kill it for fear I might die.
During the Limmir quest, my Track told me all the portals had enemies on them who stayed stationary. The flow of enemies stopped. I would have gone to kill them, but this is not a very mobile build so I stayed by Limmir. The countdown ran out but the invisible demon never spawned. I succeeded by default.
Teleports and phase doors in the race to keep the staff unpowered send you backwards. I realize that's almost definitely on purpose, but there should be a message about how some force keeps you from teleporting closer to the ritual. That's part of the reason I failed at that, though honestly I'm not sure exactly how to do this without a movement infusion. Didn't realize it was going to be so tight at 100% speed.
I cleared out two fearscape orbital invasion portals. The first one dropped niftier loot by far.
I killed Ukllmswwik and went to talk to Slasul. I killed almost all his minions and he was not hostile to me, but somehow he turned hostile before we could talk. I probably nicked him somehow.
Big thumbs up on the new lore entries since release candidate 4! I especially dug the stuff about Urh'Rok. Makes me want a demon campaign to play after the orc campaign.

Overall, lich was a lot of fun. Doomed was the only "caster" class I had won with before (my AB winner being all about daggers, not beams/bolts), and they don't have nearly the range that lich does. I also really liked having such a big HP pool, which I buffed with Corrupted Shell. Armor of Darkness was insanely useful overall, but I didn't clear out the archers fast enough during the Ambush for it to help me out. Choosing both was probably overkill? I didn't really like any of the Magic prodigies for lich.
I would like to play more with a paradox mage now, I think, but I despair of ever getting a time warden in Daikara.