Orky-O's said:
The easiest way to deal with the actually sisters of battle are to shoot them. Regular sisters are T3, although they sport that 3+ save, i've noticed if you shoot them with a Battlewagon that has 3 TL BS, 5 Bolt on BS, and a squad of 3 BS they die in handfulls since you wound on a 2+. Dealing with exorcists is just as easy. Just take a few rocket buggies. Shoot the side armor with the TL rokkit. Don't forget to bring a unit of storm boys and slam right into the Seraphim. Their I3 so if you Waagh you go first. Its really that simple.