I think I agree with people on the nun; 3 blocks for each enemy is too much to not say that if there are more than 2 nuns, it doesn't matter if you got any enemy lower than 50%—two heals and they are back to 100% HP along with 3 Blocks per each unit. It would probably be easier with more suppression or AOE characters. Stages 1-12 or R-4 are a bit unbearable even with lvl40s in that regard.