As a magic damage dealing marksman, Myca can be an extremely useful legendary throughout the game and is also a permanent fusion. With skills focusing mainly around burns and passively increasing her own damage, she provides some extremely consistent single target damage, and the more she burns the greater the damage she does. On top of this her ultimate allows her to ignore some of her targets defense and her passive lets her rip through enemies with a shield. If you are wondering if it is worth fusing her, the answer is simply yes.