//ALREADY CONFIRMED SPOILERS AHEAD// THE THREE LOS
How do you Know necromancer is a Lord? I mean, it's confirmed that the third lord is LORD OF NECROMANCERS just as Cornell is Lords of werewolves and Carmilla Lady of Vampires, it was supposed to de Death Lord of Necromancers, not Necromancer lord of necromancers 

 half-assed previews suck, please mr Cox, i think we're about time! who is the third LOS?!, WHAT THE HELL; SHOW US DEATH ALREADY!  

Edit: I just remembered I asked Cox about Death being necromancer and he said "No he's not. You have not seen death by any means" so, it's a misunderstanding. 
Edit:
Cox said:
No that isn't Death. He was in the press only trailer for Gamers night but not in this new one.
Nothing to see here people.
//SPOILERS END HERE//
Edit: Loving how Abbot Dorin is a reference to Vincent Dorin from Portrait of Ruin 

 hope it's as funny as that man