If you run CE normal the Swordbreaker is a void shotgun with fixed perks. Pretty decent too. The raid fusions are arc and solar though, so for a void fusion you'd just have to re-roll a dropped fusion until it came up void.
You might also be better off re-rolling a dropped shotgun for void too. Swordbreaker is a random drop off of Normal Crota only. So it's a once a week random chance.
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Does reforging at the gunsmith re-roll the damage type of secondary weapons??
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Yes. But only the weapons after HoW
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I think also old Iron Banner weapons. Not 100% though, haven't tried.