Having a vampire lord on a zombie dragon and thinking that the lords part must be maximum 25% im not sure if you can field one on a game of 2500 points. I do have a vampire lord on a zombie dragon tho just cause i like it

its more up to you. I mostly playing
VC with a unit of 6-8 blood knight, 1 unit of 20 Grave guards with
GW and more core units like ghouls, skeletons, corpse cart, and some zombies. Sometimes i do use direwolves and
ofc 1-2 necromancers and konrad + 1 more vampire as heroes.