After you go through many doors you finally enter a room (again and again)

suddenly you hear someone's voice saying "Hey, over here" you hear the sound from a ventilation and you enter the ventilation and the ventilation penetrates into a room where there is a half-human fish, yes. sounds strange but you see it has a really big long tail and fish fins that become ears

He has quite a large body size. He is Sebastian Solace. he greets you when you enter the room

"Oh, there you, how challange? Is it hard?"

(by the way, he could consider you as his friend if you treat you well and that sounds funny and quite adorable. But it's different if you treat him otherwise, he will be angry and annoyed or he might attack you, the point is he is quite sensitive. Anyway he is kinda... annoying)