Aurus A.K.A. The glowing gladiator.

His story all started with a normal day, and then he was invited to go diving with some friends. They had found this crazy place while fishing and wanted to claim it. They departed after meeting together at the docks to get gear situated, and arrived after about an hour of rowing. His friends started looking around telling him that this was the spot, and finally one of them saw it.

There it is! How’d it get down there!

At least 30 blocks under the boat laid a glowing city, that looked at least 300 years old. Listening to his friends bicker, he deduced that the city had somehow sunk since they visited it. (FYI The gear was meant to search for treasure under the city and they didn’t expect it to sink.)
All geared up, the team dove and pillaged the structure. One friend harvested the valuables while others grabbed uncommon materials. They met back on top of the building as they were low on oxygen, and headed toward the surface, The one known now as aurus bringing up the rear. Suddenly his foot was seized. At first he panicked thrashing around, but then looked down to see glowing teal eyes that met his gaze.

(I will put the rest of the story in the comments.)