For what it's worth, I recently have leveled a necromancer from 54-60 and my enchanter from 53 to almost 58. Even with a necro full clearing the basement and I am in north hall, clearing it, oblations and sepulcher skellies don't flee, nor do bile golems. Pyre golems, devourers and spectres do. However, Sentient Bile, The Golem Master both flee in North, but I've never had the Crypt Keeper flee even with a clear basement and the boss room empty.
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