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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That would be cool, or how about a cutscene with Shaxx in a tuxedo asking if we're ready for the ceremony?