I understand that there is an item to raise the stacks, but do the stacks ever go away (aside from a kill)? Right now on Shadowlands he is sitting at 5 stacks. Do we just have to wait for a group to kill him at 5 (or a server reset)? It would be nice if he despawned or lost stacks after x number of minutes.
It is meant to go down after a given time or when there are a small number of people in the zone. That said, the respawns/despawns have been bugged since launch, so no one really knows.