Necropolis or Castle (Which one is stronger?)

Ghosts, in addition to vampires, are good when you use a Martyr on the ghosts so that the damage goes to the vampire. Then the ghosts deal with the undead and age the living. And the vampires feed for both.
A vampire is useless against life.

Ghosts are always good, not just with vampires... and as for vampires... green potions won't make much of a difference... (the amulet works fully against them too...)

P.S. By the way, it's interesting that I'm actually for life... you're like, for death...
And right now we're arguing the opposite... I'm defending death, and you're defending life... interesting situation :) :D :)