Sometimes the ground in the western cave shakes violently. Earthquakes and moogles don't make good friends, kupo.
The Warriors of Darkness visit the Cave of Convulsion during their travels, where they find four frogs playing around by the entrance. Upon approaching the frogs, a big earthquake drops the Warriors and the frogs to the lowest level of the cave. The frogs get out of the water and run away, forcing the group to follow and collect them. Eventually, the Warriors come across a man in yellow, who is enraged that they disturbed his slumber and decides to test their power. Upon defeat, Titan can be summoned.