It clearly says that "They are utilized in combat both by Guardians[1] and enemy species" so "Guardians" does that mean some of the current three classes might be able to wield swords or will there be more? Im half sleep while making this post but just see for yourself on the site.
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I really believe that swords would take up special ammo and maybe a heavy melee variant as heavy ammo. Doubt there will be a melee class per say only due to the fact we have blade dancer.