To be honest, I'm glad prism was nerfed for several reasons. Diamond skin is my favorite skill right now, but I don't want to be "forced" (highly encouraged) to use the prism rune because it is OP. Secondly, I do think signature skills should have a purpose by design, not just for people who don't take prism, arcanot, power of the storm, and/or astral presence. The game should be balanced around what the majority of builds are going to look like, that is, balanced around the inclusion of a signature skill. I do think the niche build of avoiding a signature skill will be possible, but you'll have to work at it from all angles, and you should need more than just a hybrid defensive/resource skill to pull it off.
well, i think they nerfed it too much, going down to 10 would have been enough imho.
my wizard build at least took a very hard hit with the nerfbat, but on the other hand i am glad they are doing the rebalancing prior to release.
Yeah, it felt like too much to me as well, but that's probably because I'm biased and would prefer it to be OP so I can abuse it. . . All good points Elfik. I think I'll probably still be using it as well, but will definately be using a signature spell instead of storm armor.