Another one escaped! I encountered him just a few steps into entering TX. I'm not really sure why he wasn't moving... I think he was drinking a potion on the floor.
That gave me time to escape and head back to Attnam. Desperately searched the shops to see if there was anything I could do and I lucked out.
SPOILER ALERT. Click here to see text.
There was a wand of polymorph. I had to trade in my beautiful artifact mask (forget the name, but it was +1 Int, +1 Wis, and +1 Willpower) in order to afford it. But when I went back to TX I was able to zap him and kill him. As a bonus it turned an item on the floor into a helmet of brilliance so that was a nice consolation for temporarily losing the mask
Sadly that dwarf mine room got me. So stupid. I was 's'earching cautiously multiple times every step but I still missed a land mine.
So I had a helmet of brilliance, mithril two-handed sword +5, soulsteel plate armor, meteoric steel boots, lyre of charm, 1 leg that was changed material (dream cloth or something). So even with all that heavy equipment still had 35 Agility. Was up to 19 charisma, 16 Int. Ahhh, RIP.