You are a human child, working for the Agents at INNOVA after meeting them... at the floors bellow you were collecting parts for Chekhov...

You then grabbed out a document and read it

The Document: “The subject seems to resemble a large ram, with a notable resemblance to Bighorn sheep, with glowing growthrings with visible Malachor seems underneath the keratin. The eyes of the subject display signs of scleral hemorrhaging, causing the red colour, and the iris has deformed and displays unusual glowing green pigmentation. The eyemask has also seemingly merged with the face of the subject, with a lack of eyeholes indicating that the garment is stuck to the skin of the subject. Unusual pigmentation has also changed the subject’s wool from a silvery white to a deep blue, nearly black, with swirls of glowing green Malachor, resembling thunder clouds of lightning. Although samples have confirmed that the gas produced is Nitrous Oxide, or “laughing gas”, the exact origin of production cannot be confirmed. It’s theorised that the subject has developed a strange mutation that causes it to produce the sleep-inducing gas as a bi-product pulmonary ventilation, rather than carbon dioxide.”

You then eyed at a highlighted word "Behaviors" which a red writing (likely written by Chekhov) that says "EXTREMELY IMPORTANT PART!!!" followed by a sticky note that reads

Sticky Note: Just a Quick Warning... if you see IT then there will be Gas on this floor and it makes you tired. -Chekhov.

You sighed heavily and you read the Behaviors part of the document

The Document: “The subject has similar aggression as seen in other documented subjects. Teams have noted how it appears as though the subject is asleep, even while pursuing a target, almost as if the subject is sleep walking. It’s assumed to be driven by paranoid somnambulism-driven aggression. Due to its sleeping state, this subject moves at a considerably slower pace compared to others, and loses targets quickly.

Teams have observed that on occasion, floors with Nimbus present will be filled with a sickly blue coloured fog. The fog has been noted to cause a tired sensation, causing some team members to fatigue or even fall asleep entirely in extreme, less common cases. It’s unclear how this fog is created, though it appears as though the subjects almost cloud-like properties that cause them to be able to float, may also have some kind of gas-emitting properties. Teams are advised to preserve their energy, and tread carefully when encountering this event.”

You nodded before closing the document and before you could get back work... The Blue Gas began to fill the room...

Hisssssssssssss....

You were surprised at the gas' presence and you tried to see... and you spotted Nimbus...? and you tried to see him better...

"..."

He reveals himself to be Infected Nimbus...