What is your favorite ultimate ability for that class?

You forgot about Cerberuses and Nightmares? And what about Cursed Ground? It should already exist...Erathians aren't fast enough to destroy half of a squad...
PLEASE, remember what skills are needed for Urgash's Summon...Sudden Attack, Cursed Ground, and Fire Arrows...And Erathians aren't protected from fire...
Teleport, instant reinforcement summoning, fire attacks...that's enough...
In general, when discussing super abilities, it's not worth comparing creatures; it's not relevant.