Thunder Summit/New Trial of the Sage

Abilities

 * Thunderstrike: Lightning magic damage (5x) to one enemy.
 * Thundaja: Lightning magic damage (5x) to all enemies.
 * Osmose: Magic damage (1x) as MP drain (50%) to one enemy.
 * Flash: Inflict blind (100%) to all enemies.
 * Judgment Bolt: Lightning magic damage (10x) to all enemies. Decrease lightning resistance (120%) for 3 turns to all enemies.
 * Protect: Increase DEF (100%) for 3 turns to caster.
 * Lightning Wave: Decrease lightning resistance (100%) for 3 turns to all enemies. Inflict paralyze (100%) to all enemies.

Conditional Attacks

 * First turn: Protect, Lightning Wave, ends turn
 * Every 3 turns: Flash, Osmose, Judgment Bolt, ends turn
 * HP thresholds (once/turn):
 * 80% HP: Judgment Bolt, Protect, ends turn
 * 60% HP: Judgment Bolt, Lightning Wave, ends turn
 * 40% HP: Judgment Bolt, Protect, ends turn

Other Attacks

 * On standard turns, Ramuh uses Thundaja once, and every other action has a 30% chance of being Thunderstrike and 70% chance of being a Normal Attack
 * Under 40% HP, he starts casting Thundaja once per turn.

Tips

 * See testimonials and discussions.
 * Physical Cover Tank route
 * Use a physical cover tank to redirect the normal attacks
 * Your party will be receiving the full blow of Thunderstrike/Thundaja/Judgment Bolt, so you need to raise your whole party's lightning resistance (including innate resistances + buffs) to more than 100%
 * You must dispel your own party and reapply the buff whenever he casts Lightning Wave or Judgment Bolt at each threshold (e.g. using Bushido - Freedom or by dualcasting Dispelga)
 * Magic Cover Tank route
 * Bring a magic cover tank with Paralysis immunity and
 * 220% Lightning resistance (innate resistances + buffs). You won't have to dispel your tank after every cast of Judgment Bolt or Lightning Wave
 * 100% Lightning resistance (innate resistances + buffs). You MUST dispel and rebuff your tank after every cast of Judgment Bolt or Lightning Wave
 * Bringing a provoke tank allows you to redirect all the incoming normal attacks
 * Enhanced Kuja and Cerius with +2 for their lightning resistance buff spells will effectively nullify Ramuh's imperil (provided you have 120% lightning resistance on your magic tank), allowing a magic tank to defend against his magic attacks without having to dispel the party.