Arm 12

However, before it could be successfully sedated, the anomaly regained its bearings, produced what is believed to be arms made of magnesium oxide and an unknown substance. The collision of these two limbs approximated a flashbang grenade. SCP-3589 was not seen after officers regained their vision.

The few reports of SCP-3388 indicated that it was carried away on a series of rolling arms that acted together like a mobile platform, however this has not been corroborated.