Think of how you did when fates were up and stuff was dying super fast, you cut 1 dot and try to energy drain the person. Since we have the least about of health and MP, we must be quick and light on out feet, Anything that can boost spell speed is need, alone with the ability to avoid focus fire.

Simply rotation: Swiftcast- Bio II, Bio I, Fester, Energy Drain x2. repeat

Healer Swiftcast-Bio II, Virus, Miasma II. (Keep them from healing)

Pet put Ifirt on the BLM or Caster.

Speed is the keep, long first do use no good