Oh man, dogs is a good idea- I’d say having one around would negate the effects. Wouldn’t keep him from stalking you, he just wouldn’t be able to do anything about it while that dog’s around.
Kek, you lose your dog and your character gets all depressed. Player would put one & two together & assume it’s because the pet dog died- imagine their reaction when they find out they’re actually being haunted by an evil kami stalked by a nether-creature.
I’m not opposed to a little wandering, but just regular old traps doing them in would be too easy. Wouldn’t be opposed to a very, very high evasion chance concerning traps
-perhaps if he triggers one he poofs away, letting you recoup your sleep & morale for one night?
Just apply the debuff, (HE’S IN THE TENT WITH YOU), perhaps more depending on how limited the engine is.
If it’s just an enclosed space, that wouldn’t have an effect- he can be just outside it sapping your energies.
If it’s a different z-level or something, it’d be more complicated.
Oh and, not the artifact, a relic- the little baubles you find in cathedrals.