What An Eyesore

"There are countless offense spells," Rosetta started, "but the easiest to learn depends on one's racial talent.

"For witches with the attribute of darkness, I will teach you the simplest attack using our innate attribute—manifestation." 

Oriana thought that Rosetta would teach her that black lightning attack she used to punish her, or the ancient runes that produce attacks, like 'Arrow', 'Sword' or 'Bolt'. 

Rosetta laughed at her confusion. "Do you know why Black Witches have terrible reputations? It is because our magic alone corrodes other magic. The attribute of our magic has the 'destruction' property of darkness.