The True Titan

Abilities

 * Landslide: Remove one enemy from the fight
 * Used every 4 turns.
 * Can be avoided by having Titan triggers its Titan Core on the same turn, see strategy below.
 * Earthen Fury: Magic damage (7x) to all enemies
 * While it deals magic damage, it can be physically dodged.
 * Used by Titan after destroying Titan's Core. Ends turn after use.
 * Used by Titan's Core 5 turns after being summoned; It'll use a (100x) version of this.

Spammable attacks

 * Up to 10 attacks per turn.
 * Stronger version of its attacks are used below 60% HP threshold, after the core is destroyed.
 * Weight of the Land: Magic damage (2.5x or 5x) to one enemy
 * Tumult: Physical damage (2.3x or 3.5x) to all enemies
 * Rock / Mountain Buster: Physical damage (2.5x or 5x) to one enemy
 * Rock Throw: Inflict petrify (100%) to one enemy
 * Normal attack: Physical damage (1x) to one enemy

Strategy

 * Stone Killer is effective against Titan.
 * Golem's Stone Killer is effective for additional damage, but be wary that Golem's Cover ability may cause the holder to receive lots of damage. Think carefully before equipping Golem onto an attacker instead of a tank.
 * It's very important to break Titan's ATK/MAG and buff your DEF/SPR.
 * All of Titan's attacks are non-elemental. Earth resistance is not needed.
 * Use anti-petrify equipment or abilities. Aileen can buff your party's petrify resistance with Build Earth, and she's strong against stone monsters.


 * Titan's HP cannot drop below 60% on the turn it reaches that threshold.
 * Titan's Core appears once Titan's reaches 60% HP threshold. He'll become invincible until the core is destroyed.
 * Target Titan's Core manually to attack, but make sure to keep applying break on Titan, and not the core.
 * The core itself does not attack until 5 turns after it's summoned, on which it will use an extremely strong variant of Earthen Fury, likely wiping your party.
 * If you're lacking in healing power, you may consider bringing Minfilia with her Protection of the Twelve materia equipped. She can also buff your party's all stats up.
 * Titan will ramp up damage significantly after the core is destroyed. The fight will become a DPS check, as Landslide can't be avoided at this point.
 * After the core is destroyed, additional protection from the Golem esper, Wilhelm's, or Y'shtola's Limit Bursts can be effective if you are unable to reduce Titan down from 60% HP in one turn.
 * You can avoid the first two Landslides by triggering its Titan's Core every four turns:
 * Hit 60% HP threshold on turn 4.
 * Destroy Titan's Core on turn 8.
 * Kill Titan before turn 12.