Sen walked deeper into his underwater cavern, the light crystals in the walls matching the brightness outside, simulating the sun surprisingly well. On his left, his Kendo training area. On his right, rows and rows of crystal bookshelves, loaded with arcane tomes. His special tome not among the shelves, but hidden elsewhere. Sen slowly walked over to his Kendo area, lifting his katana from the stand, and strapping it on his back, positioning it between his wings as he always has. He slowly walked over to the entrance of his den - a seemingly shallow puddle of water about 10 feet in diameter.
Sen took a deep breath, letting it out slowly. He then took another breath really quickly, diving straight down into the "puddle", banking forward right before hitting the bottom, swimming and navigating through the maze-like entrance, finally making it to the small pocket of air at the bottom of the lake, breathing quickly at first, the pressure hurting his ears. He popped his ears, shaking his head and letting the pressure regulate. Breathing slowly now, he took a deep breath, swimming down to the bottom of the lake, smiling, pushing off the bottom hard, shooting upwards to the surface. He spread his wings wide, using them to help push the water down, his wings glowing brighter as they worked harder, a beacon of light firing upwards from the dark depths of the lake.