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 think Destiny just needs more A.I. companions in general. Eventually, I think an entire subclass node based around summoning would be cool. Although it might be out of place with the established lore of the destiny universe.