There's not even a single reason that I can think of to sacrifice your best ability (phase bomb) to use singularity instead. It conflicts with vampiric icon/psychic scream/blink and doesn't synergize with cold spell damage. Phase bomb is better against heroics, it functions as a defensive ability and doesn't take 50 skillpoints to deal mediocre damage, because that's what singularity will do without stacking phys/magical. You could just roll a shadow avatar amu instead and deal 2x more damage.
If you want a singularity based bombsin, stack phys/magical, smax phase bomb (psionic storm could be another option), singularity and doom. Use bane claw vs. heroics (although I have no idea if this will work against teleporting AI).
Gekko64 wrote:ttad only works on wdm attacks
My mistake. So on wmd attacks its
ttad + doom + doom, on spells it's just
doom.