Ancient Devil

The Ancient Devil is encountered in Otka Island, in the unmapped dungeon section that can be accessed after the player has obtained the Sol Blade. The Ancient Devil guards the Catastrophe Summon Tablet.

As a boss
The Ancient Devil has 11783 Hit Points, 500 Psynergy Points, 483 Attack, 220 Defense, 330 Agility and 50 Luck. Concerning elemental attributes, it has a Venus resistance of 180, Mercury resistance of 130, Mars resistance of 150 and Jupiter resistance of 72 and uses its available Venus based attacks with a Venus power rating of 110 and its Mars based attacks with a Mars power of 105.

The Ancient Devil has access to the following moves:
 * Demon Sign: This ability allows the Ancient Devil to take control of one of the player's Adepts. If the Ancient Devil is felled, so too will this Adept. If the Adept is felled, it will rejoin the party in KO'ed condition. The Ancient Devil will only use this move to take control of one Adept at a time.
 * While under the Ancient Devil's control, the adept is often ordered to attack, occasionally use Psynergy, and is capable of using your summons against you.
 * Haures: A summon sequence that calls the blue-skinned demon with red nails and fangs to wreak havoc upon the party. This deals a Venus-aligned attack with a Venus base power of 270 with additional damage equal to 15% of the victim's maximum HP meter. All targets also have a chance to get inflicted with the Deadly Poison condition.
 * Dire Inferno: A Psynergy spell that conjures a massive ornate shape to drop a big fireball, resulting in a huge explosion. It deals a Mars-aligned attack with a Mars power rating of 200 and a range of 5 targets. This consumes 32 of its user's PP.
 * Undead Might: A Psynergy spell summons a huge skeleton warrior to hit the target with powerful force. It deals a Venus-aligned attack with a Venus power rating of 250 to one target and consumes 30 PP upon usage.
 * Curse: This Venus Psynergy may inflict the Death Curse condition at one target and consumes 6 of its user's PP.
 * Psy Drain: A Psynergy spell that attempts to steal one target's PP with a Jupiter power rating of 20. Consumes no PP.
 * Attack: The Ancient Devil's physical attack where it uses some magical force of its book to deal damage.

Felling the Ancient Devil nets the party 55216 experience and 3438 coins and the summon tablet it was guarding becomes approachable.

Trivia

 * The Ancient Devil bears a striking resemblance to Baphomet.