Got my second ever win, first time as an armataur brigand.
There were two scrolls of acquirement within the first five levels of Dungeon. I got a manual of stealth off one of them, then used the other plus a third found in L1 to open the trove on D12. I found a second manual of stealth in lair after the first one ran out.
Tiamat was waiting for me at the entrance stairs of Zot 1, which made it easy to single her out.
I think I probably should have made more liberal use of my potions/evokables/abilities.
Dithmenos’ new activated abilities are a lot more fun than the old ones IMO, and the passive noise reduction is pretty helpful.