I think putting a sword/melee weapon class into the game would work. Probably as a special weapon. Having it out could improve agility, and there could be different types like slow or quick. First person would work well, imo. Attacks could be varied depending on left or right trigger. Like a swing for right trigger and a stab for left. They could have elemental damage and different perks, like the poison of Thorn or a perk like thunderlord where the more you attack the faster you attack. Maybe even a perk like disintegrate where a frontal shield is gained. Damage would vary depending on swing speed and weapon type. I could see some styles like a bladedancer actually living to its name and taking advantage of their invisibility and the speed of a quick melee blade to get close, or the striker chaining kills with FoH and a slow, hard hitting melee weapon, switching to it as he closes the gap to his enemy. Simply putting one melee weapon into the game won't work. Look at the case of the No Land Beyond or the universal remote (which I think should fire hard hitting slugs for its exotic perk, if they were to overhaul the weapon) They were each introduced as one weapon, not a weapon class, so many people don't take them seriously, or as more than a gimmick. Introducing a full melee class would mean that you mean business, and that these could replace your special weapon if you wanted it to. Plus, what hunter would reject the look of a light, quick solar blade at their side, or what titan would reject a huge hammer bursting with arc energy resting on their back?