What would they be and why?
Imagine how overpowered this would be...
Make it happen Bungie! :D
Edit 1: Some interesting concepts guys keep it up :)
Edit 2: Holy crap didn't realise this post was gonna be this popular, over 100 replies??
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Probably the thorn and the red death. Dot that has a life drain ability. Damage heals but kills fully heal. Make it a scout rifle with low ammo or something that balances it.