So, without further ado, here's the single spell I created for the necromancers. The text in the quote box below is hereby designated Open Game Content via the Open Game License.
Duration: 1 turn
A magic-user who casts this spell and then makes a successful melee attack against an opponent deals 1d6+1 points of damage per the highest spell level he is capable of casting. For example, a 5th-level magic-user deals 3d6+3 points of damage, while a 7th-level magic-user deals 4d6+4. In addition, the magic-user is healed for an amount equal to the damage dealt. A saving throw is permitted, but it, like the attack roll, may be foregone if the target willingly submits to the effects of the spell.