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Something similar happened to me not too long ago.

Cavern level of the Puppy Cave.

Doppelganger + Black Altar + Trash on Altar = Sacced

I first found it 10 or 12 years ago (pre 1.0). I had played some other Rogue-likes and was looking for something new. I loved it then, but wasn't patient to deal with all the bugs.

Found it...