SCP-689
"Haunter in the Dark"

Description: SCP-689 remains completely inert as long as it is being observed by at least one human individual. Ordinary behaviors such as blinking do not interrupt this observation however, any lapse in attention regardless of duration renders the observer vulnerable.

When SCP-689 is no longer being observed, it immediately disappears from its current location. Within approximately 15–20 seconds, SCP-689 causes the instantaneous death of one individual who has previously observed it, after which SCP-689 reappears positioned atop the victim’s remains.

If no living individuals who have previously viewed SCP-689 remain, the entity will reappear at the location of its last manifestation.

Addendum: N/A