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.
*Should the player check upper floors, talk to some citizens and investigate Azama's statue in order to make Sobek join the party. The player should "talk" with Sobek and then decide to attack him, if done correctly, he will join you.