1. Being Level 50 and above Summonner Class, and talk to NPC "Challenge from the summoned monster" in the Quest/Dungeon Reception Map.
Choose "Challenge from Titan,"
and battle agasinst Titan!
You will be able to receive 1 "Earth God Stone,"
item necessary in order to change class.
Once you have "Earth God Stone" and other necessities to change class
, open "Ground Shaker" from Advanced Class Manager in the base and change class!