There are 1 handed wpns, dual wield wpns and 2handed wpns.
2 handed wpns will do about twice as much damage as a 1 handed wpn but take twice as long to swing. Dual wield wpns, which you have to have in both primary and secondary slots, have a lower delay but cause a much lower damage than a 1 handed wpn.
You can not equip two 1 handed wpns. You can not equip one 1 handed wpn and one dual wield wpn. You can equip one 1 handed wpn and one shield/item, or 2 dual wield wpns.
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Voelfgar Fireforge
105 Beserker
Mangler