Rock Garden made me laugh. It was flaming and I went in with a hard-core fireball spammer because I felt like it. Found early Piercing Wand, and eroded Earth Guardian's 75% magic resistance during exploration / Mystera piety farming, in preparation of the eventual boss fight. Then I found the random boss: The Iron Man.
I was like, I just cleaned up, is there no end to all this magic resistance?
"Thinker", just without the "ache".