Verb wrote:
Since the damage is purely elemental, do you actually life steal with this ability?
Vengeance does not convert all of your damage into elemental damage, so you can life steal on the physical damage of your weapons.
That being said, a good chunk of enemies (Undead, a lot of bosses) do not allow for life/mana stealing so its largely irrelevant in a lot of cases where it counts.
For example, I am currently having trouble with Szark, who is Stone Skin and no mana leech (but she has mana burn which makes her more difficult when you do have mana to use). So I guess I'll have to move ahead and come back to her or try and find a long-range attacker to back me up with her. I had zero trouble getting to her with Conviction and Vengeance working alongside of mana leech from a Manald Heal (this is all Normal BTW), but when I got to her, it got tedious. Especially with all those damn bone cages always blocking me.