RPGMemes

Presuming you don't play Palladium fantasy, since no one does, you could steal this critter

Corpse creature

Lies in ruins looking like a week old corpse, wearing something obvious and valuable, such as a gold pendant

When someone tries to remove the valuable the corpse creature grabs them strongly by the neck and strangles them

The corpse creature doesn't collect loot, doesn't eat their kills, it's just out to bait and murder

In the Palladium system it has a strength of 23, you'd probably want to make it moderately powerful but only on its first attack

If a group approaches it'll keep playing dead, it only attacks lone individuals