Per 
Addendum-30a:
On 1/4/17, a Keter SCP broke out of containment and has caused severe damage to Site-90 and the SCP's housed in Site-90. A pipe blew up containing SCP 3453, affecting the foundation's Storage unit 27 severely. All anomalies and items in Storage unit 27 were blown out of containment, hitting a few d class, researchers, scientists, some MTF, and a Foundation researcher.
Foundation personal did containment breach protocols for everyone evolved in said Containment Breach and found the Foundation researcher had SCP 5783 lodged inside their heart. Side effects of SCP 5783 took place; personnel found their eyes completely silver, and their hair starting to follow. Cat scans, x-rays were all done; surgery was to take place immediately.
Discovery: A MTF discovered a person in the breach, later designated to be SCP 5783. When personal identified SCP 5783 as an anomaly, personal immediately contained it. The origin of SCP 5783 is yet to be determined.
Addendum-4a:
On 21/12/17, Personnel postponed surgery after finding out that SCP 5783 had melted onto their heart due to the containment breach explosion. Surgery was delayed and stopped until better planning took place for SCP 5783.
SCP 5783 side effects had finished during this time as their hair was completely silver as was for their eyes too.
Addendum-5a:
On 22/12/17, Personal postponed surgery, again. Other Foundation personnel showed cat-scans of to the surgeons of SCP 5783 more connected to the heart than previously thought; recent surgery was now fatal for that foundation personnel.
Personal rescheduled the surgery, delaying it again.
Addendum-6a:
On 22/12/17, the surgeons canceled surgery after finding out that SCP 5783 was unable to be separated. It was unknown how this occurrence happened, but personnel theorized it was SCP's 5783 last resort towards saving itself. Planing was originally going to take place for removing her heart. However, personnel later stopped this as fear of the scenario that if surgeons removed SCP 5783 from the foundation personnel's body, SCP 5783 would no longer function. Personnel brought up this scenario to the O5 council. The O5 declared that since that foundation personnel was of low clearance level and had not contributed much to the foundation. Besides research of already known anomalies in containment, Foundation personnel will see that induvial and SCP 5783 as the same. They would be stripped of their Status and given new clothes to be put in containment. The ethics committee gave all personal besides O5, A class anesthetics after the meeting was over, including SCP 5783.
A select few chosen by the O5 would not be given anesthetics of this occurrence and would still remember.
SCP 5783 in a humanoid containment cell
Revised Special Containment Procedures: Containment of SCP 5783 is to be within Site 90 in a humanoid containment cell; SCP 5783 containment cell is to have one guard at SCP's 5783 entrance at all times. SCP 5783 entrance guards take rotation periods of 2 hours each; SCP 5783 is allowed to wander Site 90 from 7:00 am - 8:00 pm. Scp 5783 is not allowed to "test" with other SCP's or be allowed to visit them unless they are allowed to wander site 90. Suppose foundation personnel confirmed an interview or test of SCP 5783. In that case, SCP 5783 becomes restricted from wondering the area during the interview or test. SCP 5783 is allowed to be interviewed or tested only by foundation personnel of level 3 clearance or higher.
Anyone who claims to "know or "seen" SCP 5783 that does not work at the SCP Foundation will be given C-class aesthetics. Anyone who is a foundation worker and talks about SCP 5783 outside of the foundation will suffer harsh consequences. Any physically owned item of SCP 5783 and any online evidence of SCP 5783 available for public view is either destroyed, deleted, or removed from the public eye and later saved for testing. Any online proof of SCP 5783 will immediately result in downgraded clearance and C class anesthetics given to the poster. Anesthetics will not follow on those of level 5 clearance or higher but, downgraded clearance will.
Any mention of the name Mrs.Vivloa or stuff involving that name or person is to be redacted or crossed out.
Revised Description: SCP 5783 is a humanoid entity that stands at 165cm(5 feet, 6 inches) and appears to have an American bloodline and is of 32 years of age currently. SCP 5783 most notable physical features are having natural pure full silver eyes while also having silver hair. SCP 5783 at times claims to “be” foundation personnel going by the name of Mrs.vivloa despite there is no evidence of SCP 5783 ever existing at the foundation. SCP 5783 possesses the ability to manipulate and input its name into SCP documents and even give false memories of itself to any living being that has a functioning memory. These false memories can vary to being friends of SCP 5783, to it being a long term foundation personnel. It is currently unknown if SCP 5783 is limited to certain memories or places, but it has shown to have no limitation to this effect. This effect also occurs not just at the foundation but also around the globe, if any instance of this occurs, whether it is here at the establishment, or someplace else. Containment protocols are to be set in place.
Due to the nature of SCP 5783, an interview is to take place with SCP 5783 as higher-ranking members of the foundation have declared to have a nudge or feel as for SCP 5783 having the power replicate itself and other items it holds. Because of this, testing and interviews, are due to take place.
