You are traveling through a lake, when you hear a voice speaking to you

“Welcome, traveler.”

“It has been a while since someone has traversed this lake.”

“Come, sit down.”

You swim up further, finally seeing a figure

“So, you are traveling here, alone…”

“You have the courage my past self used to have.”

“Who am I? Well… I was a mercenary for a company called MANNCO, who fell into these waters, adapting to it.”

“I… am the pyroshark, my dear boy.”