I use void walker as my main in pve. I find it frustrating not being able to use my super just so I can self Rez when I die. You basically trade in your super for self Rez. But no nova bomb doesn't need a buff. It's a long range fist of havoc. It can also have a burn AoE or travel even further. I do however think that the Melee ability needs a buff. It's next to useless unless you have bloom which isn't even a modifier specifically for Melee.