Discussion of the Necropolis faction.

Light magic – definitely not. The “Drain” spell works, for example. The best healing is “Necromancy.” It can resurrect units every other turn. Ghosts have good healing, which also deals damage.

Archliches work like this: you mark a friendly unit, then attack an enemy. Part of the damage dealt to the enemy will restore health to the marked friendly unit. It works even worse than with vampires :(.