Inferno tactics.

"I think it meant the general concept of a specialty... without applying it to spells like Bless or Curse."
Yes, exactly. You just can't underestimate such spells. Here, for example, if you compare Bless with Curse. In my opinion, Bless is used more often. Of course, this depends on the player's tactics, but I would rather be happy to see Bless in a guild than Curse. "depending on its level" - yes, there was a mistake there :) It happens to everyone.