Those perks were created to commemorate the Iron Lords. Since the Vow is a bow belongs to Crimson event, i would rather suggest a perk such as Vow of Love : When you get close to a team member carrying also the Vow, you will get an stronger shield colored in Crimson.
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Someone forgot I earned my iron lord status in D1, FU bungo
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Like rat king, but, you know... [spoiler]actually good[/spoiler]
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Anything is fine to me because the bow right now is lame
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Pair it with Last Word. Have fun with it.
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Then give me a thump up