Also why Balor is amazing for an event kamihime (as in, no rolling for her; you get her by being active in the event she's in); she's a dark mini-Mordred. She has debuff-resistance debuff, poison, dazzle, burning (I think..), blind, and paralysis.
Mordred still inflicts more stuff, but if you plan to go dark, or at least include Balor in your team, the overlapping of some effects kind of devalues both. Mordred also completely obsoletes Pale Rider (another dark event kamihime). Just a heads up if you happen to have planned to use either of the two.