Best traits for Vampire Count Lords and Heroes?

Title. Going for the VC Very Hard/Legendary achievement as Vlad and I know the general idea is to spam Skeletons, Vampires, and Necromancers.

Any particular traits I should be keeping an eye out for on the Lords/Heroes?

EDIT: Adding in a bit of a helpful PSA here at the end for my fellow VC first timers. \*Ahem\*

**DO NOT LET UNGRIM RECRUIT UNITS. RUSH THAT MAN DOWN IMMEDIATELY. MY CHEEKS HAVE NEVER BEEN MORE THOROUGHLY CLAPPED.**