This ability allows the chieftain to to lay traps to ensnare wild animals.
Your Chieftain will set up a trap and walk away, and animals will then gather around it. After a short while the trap will release a poisonous gas that will kill the Creatures instantly, and your tribe members can gather the meat. After the creatures respawn, they will be hostile towards the tribe.
This is the carnivore version of the Refreshing Storm ability. It also works on epic creatures.