Purpose of Sign Of Jhebbal Sag?

I’ve used it to spawn werewolves but is there any purpose beyond that? They just fight me. Can they be tamed in anyway or is it just a quick way to get shadebloom by skinning them?

Far as I know, it just lets you harvest shadebloom from the summoned werewolf.

Normal ones? Because the boss one gives you the flesh of rememberance to learn the religion. That’s all.