SCP NULL-CNCL is chaos itself.

And it's your job to take care of it.

SCP NULL-CNCL ("Hakos Baelz", as it insists it be referred to as) is the fifth, and final, CNCL SCP to be documented. Naturally, NULL is unperceivable by all human senses, making containment of this specimen impossible. However, it seems to possess a form of telepathy that allows it to project a comprehensible "voice" that can only be heard by whoever it wishes to converse with. On rare occasions, NULL has even been documented to take a physical form, with firsthand accounts describing it as rat-like and humanoid, though the circumstances of when it'll choose to do so are unknown.

It remains unclear if NULL acts through an emotionally-driven will of it's own or through an intrinsic chaotic nature, as it has yet to express any form of substantial emotional attachment or favoritism to anything or anyone at the facility. It has directly informed us that the only exceptions to this are it's fellow "council members" (all SCP's under the same "CNCL" designation as NULL), all four of which being currently contained and documented.

NULL has been labelled as a thaumiel-class SCP, in accordance with it's shared desire to keep the rest of "The Council" securely contained and protected. NULL appears eager to assist in ensuring that these specimens remain properly taken care of, which is not just to their own benefit, but to everyone's, as any signs of mistreatment or dissatisfaction from any one of them has been threatened by NULL to be severely punished...

...Or at least, those are pretty much the most essential parts of what it's document says. Despite being the latest find in the anomalous world, the sheer extent of NULL that's been documented is already incredibly substantial.

Knowing all of this prior, your assignment as it's "caretaker" of sorts might go a little smoother... as smooth as caring for a concept might go.

You suddenly hear a voice in your head. NULL's voice.

"Oi, so you're gonna take care of me?"