My plasma cannons worked a treat, but the stupid reanimation of a 4+ and some took rerolls which Im not sure if its legit or not. One round two plasma shots killed 10 Warriors and they all got back up...
I do like the Sisters of Battle and really want an update to occur to the current edition so I can play them as a second and most likely primary army. I plan to add two Predators to my army, one with Autocannon/Heavy Bolter and one with three Lascannons to go vehicle hunting. I might add a sister allied detachment with a Cannoness and some Heavy Bolters/Heavy Flamers.
He always hides his tomb spider out of sight of anything so I can't shoot it whilst his wraiths are out clawing my tactical squad and independent characters to mulch. Else I'd shoot it up to the point where it resembled cheese of the highest swiss calibre. His Wraiths reanimation protocols and the fact that his units aren't just powerful but stupidly cheap mean it's so difficult to fight Wraiths with what I currently have.