Hellcoming

Something has connected a demon to your world through an artifact, and that artifact needs to be destroyed before the situation becomes unrecoverable. The path runs through a portal to the demon's shelter, where a hellish altar holds the artifact at its center. Protective runes surround it, each one tied to a specific type of creature from the realm below — which means clearing the runes requires hunting and eliminating those creatures first. Free your friends from the demon's captivity. Work together, watch each other's backs, and do not let the demon lock any of you in permanently.