Destiny has many unique weapons, such as the Sword of Crota and the relic shields. A weapon that I feel would add an even more unique feel to this FPS would be a flamethrower. Especially since a flamethrower as a heavy weapon sounds really fun for PVP and PVE purposes. I would imagine that a flamethrower would have to be pretty powerful, so in exchange it should run out of ammunition fairly quickly, and have relatively short range. But in exchange, it could have unique perks such as lingering damage (Which only Thorn and class abilities currently possess), and upgrades such as "The more damage this weapon does, the more damage it deals. (Temporary buff)" Just imagine the sight of someone literally blazing through a PvP map, leading a trail of the enemy's flaming corpses behind them. While it may be quite the undertaking, you already have worked some magic with the particles that the Sunsinger subclass leaves, so I think you guys could work a little more magic into the game.
*Vote for whether or not this seems like a viable idea!*
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Exotic Flame Thrower ICE Stream (Instant Crystallizing Energy) Arc Energy Flamethrower Crowd Control Send It Single Point Sling Field Scout ICE : Arc Flames from this Flame Thrower inflict a debuff on susceptible targets that makes them unable to move as long as they are being hit. DOT inflicted as well.