How awesome would it be if you could have a sword on your back going into battle against the cabal and fallen. I personally think it would be a great incentive to try and beat the vault of glass if you get an awesome bad ass sword!!
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I think its actually a great idea! One it would be cool to be able to change the melee weapons of some. Like say titans get a arc battleaxe or crazy light sword, and the warlocks could summon a sword and could choose to use it as a melee or as range like the throwing knife, and the hunter could change their knife to a katana or machete. Two because it would add to customization, combat, and character diversity having them each have their own type of melee weapons.