demogrogon

how does the sacrifice work? i didn't find any hole to place a sacrifice.
where am i supposed to find animal sacrifice?? argh

[Memnoch]

You're meant to use your creativity (and maybe your conjuring/summoning spells) here. That should be enough of a hint. If you want total spoils..........
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Summon an animal or monster and make it walk to the front of the altar.