Classification: Euclid

Special Containment Procedures: SCP-XXXX is to be affixed to a wall by 3 restraints made out of tungsten steel in order to prevent mobility. These restraints are not to be removed for purposes other than research or replacement due to corrosion, which must happen bi-monthly
The cell in which SCP-XXXX resides in is to be cleaned thoroughly thrice a week by 2 D-Class personel wearing acid-resistant clothing and a security guard to monitor the process is to be positioned outside the door.
Establishing physical contact with SCP-XXXX is prohibited outside of research, and all attempts to do so are means for termination.
Instances of SCP-XXXX-1 are to be contained on an on-site psych ward for research purposes until they expire, after which the bodies can be dealt with without special procedures.

Description: SCP-XXXX is a 150 centimeters long, dark green severed tentacle, anatomically similar to that of Octopus vulgaris. The surface of SCP-XXXX is coated with an oily layer of mucus, while the severed end of SCP-XXXX is constantly leaking a black substance with mildly corrosive properties and the viscosity of blood.
SCP-XXXX is capable of locomotion and will try to grab and wrap itself around anyone who comes near, if it hasn't already. It is strong, capable of easily braking human bones by crushing, but it isn't strong enough to brake most metals.
The skin of SCP-XXXX is tough, and cannot be penetrated or cut with any human means.

When a living human comes into contact with SCP-XXXX, their body will be posessed by the object, which will then try to make the victim enact a certain ritual (see Addendum-XXXX-01). This effect will cease if physical contact with SCP-XXXX is broken, or if the posessed individual (hereafter referred to as SCP-XXXX-1) expires.

When SCP-XXXX is posessing an instance of SCP-XXXX-1, it completely ignores all non-fatal injuries to SCP-XXXX-1. For this reason, SCP-XXXX-1 will be able to operate after extensive damage, as long as they are still in contact with SCP-XXXX. SCP-XXXX-1 are also stronger than regular humans, since SCP-XXXX doesn't care about tearing their muscles.

Instances of SCP-XXXX-1 no longer in contact with SCP-XXXX are effectively braindead, remaining in a vegetative state, and have completely white eyes. On irregular intervals, they will vocalise, sometimes even by using sentences. Most of the time, these will not make sense (for an incomplete list of recorded vocalisations see Addendum-XXXX-02).