Disenchant is a level 120-H skill you obtain when you reach Hero as a billposter. Like the other Hero skills, it does consume 100% of your MP and FP when activated. In order to upgrade this skill, you must select the "upgrade Hero skill' option on the Mysterious Girl in Volkane Dungeon. You then must offer a jewel set (diamond, sapphire, emerald, ruby, topaz) in order to attempt to upgrade it. The upgrade may fail and each attempt requires a whole new Jewel set. Disenchant is a PvP based skill which has a high chance of un-buffing the target giving a billposter a cutting edge in the arena.