Sounds like a cleric. Clerics are often essential for party support. Unfortunately, they tend to miss out on the spoils in multiplayer. Loot tends to belong to he who lands the killing blow, and the cleric doesn't tend to get that involved in combat. If a system can be worked out to share experience and loot through non-direct combat (just how much support does a healing spell provide), this could work.

Is Divine Divinity 2 going to be just multiplayer or will it be a MMORPG?

Perhaps a cleric class (assuming there are classes) could have area effect versions of the spells like Bless and Spell Shield. Or like the Paladin in Diablo II, he could have some aura effects that slowly drain his mana (or rapidly if they're good).

I've always had a problem with the undead being singled out for destruction. It seems there are so many advantages to killing undead (maces do extra damage, turn undead abilities, etc.) Why can't there be anti-orc or anti-human spells? Why always undead?