During the first time when Cave of Convulsion is accessible, the party should be around level 20. Titan often counters the party's attacks. His physical attack and Right Arm ability can deal about 200 damage to front row characters. Bear Hug does a bit more damage and inflicts Sap, while Earthquake can deal about 100 damage to all party members. When he is about to be defeated, he will use Gaia's Wrath, which will do more than 250 damage to every character.
A Trident can be found inside a chest in Cave of Convulsion, a Wind-based weapon, ad as such good against Titan. Monk can use Aurablast 2-3 times before his MP runs out. Mages should cast Slow, Protect and do heavy magic, such as Fira. When he begins to cast Gaia's Wrath, he is about to be defeated. The party is healed well with Cura or Sylph.
Titans were members of the second order of divine beings in Greek mythology. They were descendants of the primordial deities born from the Chaos, and they preceded the gods of Olympus, who went on to overthrow them.