Asmodeus's attacks include Hammer, which deals moderate single-target physical damage, Venomous Sting, a single-target physical attack that inflicts several status effects at once, and Thundaja, a lightning magic attack that can be absorbed as a genome. He can also afflict Charm on the party through Lust. His signature attack is Call of the Infernal, which drags one member of the party into the Infernal Realm.
That character will have the status condition "Out of Battle" while remaining in the Infernal Realm and will still regenerate BP as well as keep all his/her buffs, status conditions, etc. Asmodeus can only hold one character in the Infernal Realm, however he can Release that character and use Call of the Infernal on another character later. Being released will erase their buffs and afflict Charm that will bypass all methods of immunity with the exception of the Charm Immunity ability from the Performer job.
Asmodeus [+] Edit
An upgraded version of Asmodeus can also be encountered as a Nemesis. Aside from being stronger than his normal encounter, he has the passive ability Slow and Steady that buffs his speed stat by 50% whenever he Defaults and he can hold more than one character at a time in the Infernal Realm. So it is possible to lose to Asmodeus [+] by letting everyone get held in The Infernal Realm, effectively giving this match an indeterminable time limit.
Asmodeus is a king of demons known from the deutero-canonical Book of Tobit, in which he is the primary antagonist. The demon is also mentioned in some Talmudic legends. He was supposed by some Renaissance Christians to be the King of the Nine Hells. Asmodeus is referred to as one of the seven princes of Hell, and in Binsfeld's classification of demons, each prince represents one of the seven deadly sins. Asmodeus is the demon of lust.