[Heinrich, Klaus, Julian, Ragni]
The mutant cultists are all dead. The innkeeper and the other survivors are confused about what happened - they remember the roadwarden arriving, but are unsure what happened after that.
It seems likely that Hans drugged as many of the staff and guests as he could, then let his mutant friends into the inn to deal with the others. The demonic temple below the inn was obviously very old, probably predating the inn. The cultists intended to sacrifice their prisoners to their demonic god, but were still celebrating their success at the time the group arrived.
In any case, the cultists have been defeated. The innkeeper, still under the influence of the cultists' drugs, invites the group to help themselves to food and drink, and to stay in any room they like. He apologizes for not being able to serve them properly.