Maybe the nexus is never attacked in the game because players go in realms and kill monsters? It would make sense, because in dungeons you often seem to counter an evil plan to destroy the nexus.
Also killing foes would keep them at a rather low, or at least acceptable number, preventing them from gathering and attacking the nexus.
Nexus was attacked before in battle for the nexus. Or when GMs decided to spawn stuff in nexus. I believe this happened a couple time. As for the class? If I have all the stuff that I currently have it would be priest. Max legendary pet with prot is hard to kill especially if there is no maxed ceiling.
Definitely a Necromancer. I am always depressed, I am always depressing. I suck the life out of people. And I’m pretty fucking useless, in the grand scheme of things.
In such a world, I feel like healers would be priceless (since people would be scared for their life), especially necromancers. These guys could attack at long range and destroy hordes of monsters with their skulls, while healing their allies. With proper equipements they could also slow down monsters for additionnal support.