Hello,
wouldn’t it be better to have rather some (maybe expensive) lure traps for the big boss spawns?
On RP server we play it doesn’t have much sense to build non-immersive foundation build to get the big monsters spawned.
EDIT: Also, once you figure out how to summon the big ones, you don’t pursue to even bother with the lesser ones. I can imagine that player would have to make a totem from the lesser one demons corpses to lure then big one maybe? 