Don't have a save handy as I wound up dead, but essentially I ran into some sort of crazy Plant in the Gloomy Forest that was invisible and invincible---couldn't even right-click inspect it, melee engage it, no AoE could touch it, and it generally just kept around one big room and pelted me with poison.
This is a first, and even stranger than that old bug where Archliches Thunderstorm would just hang around a vault or mini-room forever after they die---so I'm guessing something went really funny in this last update.
[1.1.3] Invincible Invisible Foe
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