i've played cabal and the spells i saw ( played all classes but not much ) we're not unique , all spells in most games are like stun for x sec , damage +x bla bla bla , what i meant in "unique" is that the spells must use different formula , many variations , flashy animation or w/e can come in mind just not famous fireballs , meteor and so on
btw that Ragnarok bard class got me interested , might give it a chance on *cough* servers