Vorpal Weapon buff show up on left side of screen when shooting bosses without the catalyst completion. I noticed this was happening during Dares of Eternity and tested to see if it would happen again in a Lost Sector. Not sure if the damage is actually increased on the bosses, but it shows up in the buff list.
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Yes, but you'll notice the damage doesn't change until catalyst is complete
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Shhhhh; don’t tell bungie that.
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Curious finding!