Jellyfish?

He stopped when he was about a hundred meters above the light source.

He was looking at a flickering, umbrella-like object that was releasing a swirling torrent from its center, which then went all the way toward the surface.

"So that's the culprit. But… whatever is that?"

He already sensed dreadful power coming from it without getting too close, and it wasn't friendly. In fact, he was almost sure the power was attempting to invade his body at this moment.

He couldn't make sure whether that thing was alive. It could also be a very deadly monster.

He decided to return to the ship for now instead of recklessly approaching the unknown presence.

"Sir, what is down there?" Erwin saw Angor coming back and quickly asked.

"There is something… strange. But I don't know what it is yet."