Miraculously we slayed him with the help of the 2 metallic scorpions (scaladars), a lich and a demilich. The lich had counterspell or it would have been over in moment 1. The socerer cast wish in the first round and it was countered. She tried to summon a giant and that was countered. Freya then was the star of the hour, she cast "mini molten missiles" which is a spell based on magic missile but heftier and requires coins to work. She was able to use a 6MP focus to cast it with 9 missiles using platinum coins for 4d4 each, and additionally used "slow time" based on a potion she drank earlier allowing her 1d4+1 turns at once (she rolled 4, so 5 turns! Okay follow me here, in addition she used Tides of Chaos to get advantage because this spell uses ranged magic attack and cast it for tier 6, then two more times for a total of 15 missiles. 14 of which hit for a total of 131 damage in the same turn! It brought him down to -7/246 HP.
If he had one more turn, it would have been bad, he'd gotten the demilich down to a few HP and the lich was way outclassed. He had 3 legendary moves per turn and 3 legendary resistances, so he was nearly unstoppable. A lot had to go right for us to win here. He also had auto-resurrect but it was blocked by the orb and he was sucked into the negative plane, destined to spend ages fighting the creatures there as Ashley once did.
We're going to use his body to resurrect the lich to living form per her request.
