I tend to play a bit fast and loose with Tev’s IC spec. I figure while in the Scourge death knights were taught all of the spell schools, but typically gravitate to using one in combat over the others. Thassarian, for example has a ghoul but Blizzard will usually give him frost spells.

Tev’s a blood DK IC; blood what he’ll use in combat, but he’s not above summoning a ghoul when he wants cheap, dumb labor, or throwing snowballs at someone using frost magic.

OOC I waffle pretty heavily between frost and unholy for Tev’s offspec, depending on what I need for PVP/PVE.