Hunter
Torrent rider (even though the subclass is called Trapper)
Summons a powerful source of void energy, and makes the user disappear in a burst of void energy. The user appears high atop a torrent of void energy. The user then controls where he moves, and the torrent deals extreme damage to those near/around it.
Tree upgrades: harder to kill,
More DPS, multiple sub vortexes at lower heights
Grenades;
void well: place a hidden void well on the ground, which when triggered pulls enemies toward it and deals DoT
Depth charge: manually triggered charge that deals powerful void damage; can stick to all surfaces (sparrows and other enemies)
Some sort of split and track grenade
Edit: just realized this was not an entire subclass thread but rather just create a super.