In UC in the mage quarter up by where you would spawn taking the shat portal or a mages portal theres a huge skeleton head right there beside you...simply jump towards it and you will go inside it and be on a ledge, hidden inside the skull and free to gank everyone that spawns (of course ally wont spawn there but im just giving you an idea of where its at...if needed will post a screenshot)
be sure to keep those NPCs beside the spawn point dead though or else they spawn guards.