New spells.

It seems the spell is called not "Gore," but "Sorrow." On the expert level, it's undoubtedly a great thing. However, it's not always advantageous to use it. While mass spells are being cast, a considerable amount of time will pass, and then high-level spells like Berserk or Dominate look much more interesting than Sorrow. So, in my opinion, it's not very popular. Unless, perhaps, for Humans and possibly Demons, who have issues with magic power and therefore don't use high-level spells very often.