The Tiryagyoni Realm

Abilities

 * Toxic Tongue: Physical damage (5x) to one enemy. Remove resistances to status ailments for 2 turns from one enemy. Inflict 2 random status ailments (poison and paralyze 100%) to one enemy.
 * Cleaving Slap: Physical damage (6.5x) to all enemies.
 * Foul Breath: Magic damage (10x) to all enemies. Inflict 3 random status ailments (100%) to all enemies.
 * Seize: Inflict stop (100%) for 3 turns on one enemy.
 * Stone Gaze: Inflict petrify (100%) on one enemy.
 * Viscous Lick: Magic damage (3x) as HP drain (30%) to one enemy. Magic damage (3x) as MP drain (30%) to one enemy.
 * Splattering Decay: Inflict 1 random status ailment (30%) to one enemy.

Attack Pattern

 * Counters:
 * Physical attacks with Splattering Decay to the attacker (max 1/turn).
 * Magic attacks with Splattering Decay to the attacker (max 1/turn).
 * 70% threshold:
 * Foul Breath
 * Seize
 * Ends turn
 * 40% threshold:
 * Foul Breath
 * 2x Seize
 * Stone Gaze
 * Ends turn
 * 20% threshold:
 * Foul Breath
 * 3x Seize
 * 2x Stone Gaze
 * Ends turn

Phase 1 (100% - 40% HP)

 * 9 actions/turn
 * Every 3 turns: Viscous Lick
 * Every 2 turns: Cleaving Slap
 * 2x Toxic Tongue
 * Remaining actions are normal attacks

Phase 2 (40% - 0% HP)

 * 9 actions/turn
 * Every 3 turns: Viscous Lick
 * Every 2 turns: Cleaving Slap
 * 2x Toxic Tongue
 * Stone Gaze
 * Remaining actions are:
 * 5% chance: Toxic Tongue (max 1/turn) -or-
 * normal attack

Tips

 * Bring a physical cover tank, evade preferably.
 * A magic cover tank with status immunity can save your party from status ailments.
 * A support unit with Rikku's Pouch, a Ribbon, and a source of stop prevention or removal can easily cure most status ailments the boss throws out.