Unholy Death knight build from WOW would be good.
You divide your points mainly into geomancer and necromancy to increase the % of your heals from poison and the damage you do. Grab teleport from Aerotheurge, and this will be your gap closer, and atleast one point into warfare, so you can grab some aoe skills like whirlwind, and the rest of your points should be put into geomancer and necro to increases your heals. You also might want to keep strength, intelligence, and constitution balanced. I would also wield heavy armor and carry a big sword.
