Summon Raven: Unaligned Skill. 15 Energy Cost, 1 sec cast time. 10 secs recharge.
Summon a lvl 5 Raven to attack enemies. The raven is not undead, and will LEAVE A CORPSE. The raven is green and can be targeted and killed by your team's attacks.
Whether it will be overpowered or not can be determined by fiddling with the numbers. (I'd prefer it wasn't made elite... it should be available fairly early)
They key point, of course, is to give a necro an expensive way to generate a corpse when there are none available. But creative uses like making a mini-suicide bomber by casting death nova on it, and stuff like that will be fun. Or a w/n using the raven as a fast way to teleport to an enemy's location. (since the raven flies more quickly than he can run.) And it would help a Necro with wells become a more viable healing option.
A Mes/N could use echoes and arcane echoes and be pretty cool too, with every Summon Undead spell, get 4 undead before a battle begins

What do ya think?