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Laconic Containment Procedures
Keep it in a big steel box and DON'T LOOK AT IT.

Laconic Description
It looks like a person except it's unusually tall, very thin, hairless, and has opaque white eyes, arms almost long enough to reach the ground, and a huge mouth. It mostly just walks around or sleeps unless someone sees its face, including photos and video, at which point it has a meltdown, travels at anomalous speeds to whoever saw it, and kills them.

Additional Context
It killed most of the people sent to retrieve it, shooting it doesn't work, an unidentifiable dot in a photo is enough to trigger it, and it it will still get you if you're on a plane or deep in the ocean.