I did some thinking and what if some Guardians could wield the power of the Darkness?
Warlocks- Deathbringer
"[i]You don't have to be the only one having fun being dead[/i]"
Super "Ultimatum":Sacrifice yourself whilst bringing your foes with you.
Titans- Gravekeeper
"[i]Sure, you're going to have to dig a few every now and then[/i]"
Super "Shadow Crush": Create a wave of shadows to decimate your enemies.
Hunters- Darkrobber
"[i]Hey, it's called borrowing without asking[/i]"
Super "Shadow Copy": Forge a shadow of ultimate destruction, in the form of the weapon you last used.
New Race- Wanderers
"[i]They came from that place? I thought they were all consumed[/i]"
"[i]That's the problem, they were...[/i]"
The Wanderers are a race of ancient humans that were transformed and consumed by the Darkness, although the Traveler freed their minds from its enslavement, their bodies remained with them granting a few of them the power to wield the Darkness against itself, [i]Fighting Fire with Fire[/i].
[spoiler]What do you think?[/spoiler]
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A poison DoT class would be what I'd want.