I remember several games a while back where someone (ironically, it was usually Varn Gossam) captured Losha Valas. The Malakim then gifted vampirism to many of their units and crushed the Calabim with a Losha that kept gaining immortality , dieing, being reborn, regaining immortality....
I suspect this was from the command promotion with an inquisitor, since the domination spell doesn't have much of a chance of working against so strong a unit. Also, I don't think the AI uses the spell anyway.