The Vow should have the Memory of Timur perk from D1 Rise of iron.
Memory of Timur: Melee attacks on minor minions of the Darkness have the chance to temporarily turn the target against its allies.
But in the Vow it should be non lethal hits.
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I always disliked that perk. The "fighting" that the enemy did for you was never very much or very good. Mostly it just meant that I couldn't kill that enemy after I changed them over to my side. I thought it was a waste. I usually used the one that got rid of sprint cool down.