-RESEARCH EXHUME CORPSES (20 seconds, 125 Gold, 100 Wood): This upgrade
allows Meat Wagons to generate a fresh corpse
every 15 seconds.
a Graveyard create 5corpses every 15sec
Obsidian statue Mana Regeneration:1.5
Spirit Touch (Autocast)
Restores 3 mana to nearby friendly units.
Spirit Touch Information
This does not stack with other spells of the same type. Two Obsidian Statues replenishing mana do not do so faster than one.
This spell costs less mana when less targets are available: 5 or more targets: 10 mana; 4 targets: 8 mana; 3 targets: 6 mana.
This spell affects a maximum of 6 units per casting. Multiple Obsidian Statues can be used together to recover mana for a larger number of units.
http://classic.battle.net/war3/undead/units/necromancer.shtmlMana Regeneration: 0.667 (1.167 Stats when fully upgraded)
Raise Dead (Autocast) Raises 2 Skeletons from a target corpse.
8sec cooldown /// Mana cost 75
75/4.167=every 18sec necro can cast skeleton, when upgraded, when towers are healing mana at max rate
75/3.667=every 20.45sec necro cast skeleton, when not upgraded
So thats pretty good.