Rat Monarch in Hexx Ruins
Made my most embarrassing mistake so far... Prepped GG thinking I would use absolution to start attacking high levels more easily, and cleansing to deal with revenant poison. Completely forgot about the large prayer beads! Of the 20 people who have played so far, I was the only one to make this mistake!
Second altar was PM, I had to explore about 80% of the map to find Mystera for converting. A lucky combination of platemail, LEMMISI and Cha'Dylan subdungeon made this dungeon very doable.
Pretty much the only thing I did right was avoiding mystic balance in favour of body pact and usable LEMMISI.