Diabolos is not that big of a server to begin with (mid size population at best, was ranked something like 14th last I saw among NA servers) and the server as a whole is not very big on pvp yes. As a result you won't find many (if any cause I have never seen one either) PF's for wolves den. My maelstrom linkshell has people that try to organize a run sometimes for the weekly challenge log but finding people that will go is still as painful as pulling teeth. There was one person who was trying to organize a big wolves den event for this weekend but idk how that's gonna turn out.