Life Draining Ability
Disregard what Arreat says on the matter. The BG's life drain is now based completely on its own attack rather than the total amount of your enemy's hit points. Furthermore, if it is affected by a damage return ability like Thorns or Iron Maiden, the life drained is based off of its attack rather than how much damage the enemy attacker did to it. Without a heavy investment in points, it's not likely that it will be making up the difference against some of the nastier melee attackers in Hell and it remains highly vulnerable against elemental attacks.