Oh, it also had the [evil] tag, which means that just how a spell tagged [fire] releases elemental fire into the world, a spell tagged [evil] releases pure evil energy, magically making the world a worse place… somehow. For reasons. 3.5 loved to give alignment mechanical effects, it had one or two books (Vile Darkness was technically for 3.0) entirely dedicated to hard rules for morality.
But 5e doesn’t have tags like that, and alignment is almost irrelevant. Which is probably for the better, because alignment is incredibly subjective.