Sobek appears as the first boss of Akira Miyamoto's route on the last floor of the maze in Land of Nomos. Initially, Sobek does not show interest in fighting Tamaki Uchida and Akira, and just wants to chat. He constantly asks how a human could have the power of Amon, what they are doing in Nomos, and if they have met the Deity Emperor Hazama. Depending on the player's choices, Sobek will either heal the party, give them items, block the party's magic, or join the party. He will only attack the group if Tamaki chooses to.
If either Tamaki or Akira have 12 points in both strength and intelligence, Sobek will join the party if the player first talks with him and then fights him. He can also be created through fusion once the player has recruited him or defeated him in battle.