The surface of the sea beneath his feet began bubbling like water being warmed, and then a thin glass-like barrier began shifting out from beneath.
It raised the water into the air, higher and higher, until it touched Ryuk's feet.
Then, like a void vortex, he found himself easily sinking into it.
Soon enough, both of them were swallowed by the barrier, which dipped back into the ocean and completely disappeared from view, the sea returning to its calm waves.
______
"It's dark." The words echoed straight into Ryuk's head as he stepped forward through the blackness.
Iris's voice made him pause mid-step.
With his current power level, there wasn't much difference between day or night, but Iris was an exception.
"I'll get the light on," he replied, turning to the side and walking up to the wall.
He reached for a switch and flicked it on.
Bright white light flickered across the entire space.