My previous SCP concept was given some great criticism and has helped me come up with a more refined idea.
This SCP is a small skeleton of unknown origin with unknown carvings covering the skull. A low humming can be heard at all times from 20 meters away. The source of this is unknown but it uses this humming to get a subject to come within 5 meters of the Skeleton. At this point, the subject will begin making the same humming noise as the skeleton makes. After only a few minuets, the subject will stop humming and will drop to the floor, their face white and their body cold (but still alive). After this, new carvings can be seen on the skeleton.
There is quite a bit more detail in this version but it's still not complete. I added more detail in hope that much more ideas can sprout from this. I hope this new version is at least a bit better.