Entry 1: Background information on D-88634
Research into the background of D-88634 shows us that it was previously known as Arthur C. █████ a Death Row inmate. Located in [DATA EXPUNGED] prison. Interviews with the inmates which has contact with D-88634 describe him as a "born leader" and Prison Guards from the time of it's incarcerration describe D-88634 as "one of the top dogs, yet still cooperative".
The criminal record of D-88634 is clean, but for his murder of [DATA EXPUNGED], Arthur C. when questioned at the time could only justfy his action by "I just felt I had to kill him, I felt it very strongly. I don't regret doing it.". Investigation into the victim shows that he was preparing to orchestrate a school shooting later that day.
Further research into the past of Arthur C. shows it's possible involvement in the destruction of a satanist cult by burning down their place of worship while all of them were inside. Foundation research could not confirm it's involvement.
Post recruitment in the foundation D-88634 was a model D-Class. Willing to cooperate with researchers and often acting as a leader towards other D-Class. Looking trough the data of experiments D-88634 was involved in once can clearly notice that the effects of SCP's on D-88634 are oftentimes "too perfect" the only abnormalities in test results can be found in cases where giving the "perfect response" would have endangered D-88634. Similarly ideal results can be observed with the use of Amnestics on the subject, with unusually small sideeffects. Here I'll propose a rather controverssial theory, I believe that D-88634 has been faking the effects amnestics and SCP's had on it.
Entry 2: Interview with D-88634
This was rather pointless. Talking to D-88634 did not reveal any form of anomalous behaviour or evoke suspicion in any way. The responses of D-88634 were not "too perfect" either, with the individual having forgotten certain information.
Entry 3: Further work trough it's past.
After the interview the O5 wanted to cancel further investigation, but I managed uncover a further unusual event in the many years D-88634 has been working for the foundation, thus being permitted to continue the investigation.
At the site of SCP-354 usually shortly before an accident (1-8 days) D-88634 would succumb to illness or be wounded by a fellow D-Class. That way SCP-4764 avoided contact with: SCP-354-3, , SCP-354-6, SCP-354-14 and SCP-354-15. D-88634 was otherwise healthy and encountered SCP-354-4 and SCP-354-16.
Entry 4: Investigation using SCP-1202
D-88634 was made into a host for SCP-1202. D-88634 seems to be unusually eager to converse with SCP-1202, though as with other D-Class it soon starts to become annoyed. During the next days D-88634 has problems sleeping and as most other D-Class before it start resorting to shouting SCP-1202 down. Unlike it's previous host this D-Class starts asking for death on the 8th day.
Entry 5: Something is deffinetly not right.
It's the 10th day and the behaviour of D-88634 is typical. Endless cries for death coupled with progressing insanity. Something is not right. All lie-detector tests show that D-88634 is genuine and once again there are calls to end "the trial". I manage to ask for one more favour from [DATA EXPUNGED].
Entry 6: Utilisation of SCP-645
SCP-645 is disguised as one of two archaic handcuffs and hidden beneeth a piece of cloth. The SCP-645 is put on one of D-88634 hands. At that momment I decided that if D-88634 looses it's hand no first help is to be applied, the personell applying the SCP did not have that information.
Uppon applicatipn of SCP-645, D-88634 was once again asked "Do you wish to be euthanised?"; D-88634 did not answer. Repeated asking did not bring fourth an answer, instead D-88634 started violently shaking and screaming as if it completelly lost it's insanity, but not making any concrete or factual statements. This continues for multiple hours with D-88634 either screaming or repeating what SCP-1202 is saying. These symptoms have previously not been registered in regards to SCP-1202.
Entry 7: The removal of SCP-1202
SCP-1202 was removed and D-88634 administered amnestics. The D-Class returned to normal or as I suspected "stopped pretending". D-88634 is deffinetely a persistent one, a 3rd time I am asked to stop the experimentation and me seeing it's "insanity" as proof for my claims has been likened to delussion and obsession.
Still the O5 has aknowlaged that the sudden "insanity" of D-88634 was unusual. I'm glad [DATA EXPUNGED] interveened on my behalf again. I have been granted permission to use SCP-923 to end the investigation. This is the last experiment I'm permitted to perform, as such I have to be careful to proove the anomalous properties of D-88634.
Entry 8:
D-88637 as well as 8 newly recruited D-Class have been prepared in an Arena. All 9 of them have been convinced it to be a routine test.
SCP-923 is activated and targets the D-Class at 23 power. The subjects hear voices and interact with people not present there. Some of the D-Class start already attacking one another and becomming paranoid. Their restraints make them not damge one another too much.
The intensity is slowly incresed. At 29 the first jubjects start harming themselves. Up untill 65 intensity the symptoms do not change except a growing intesity. At arround 67 we see D-88637 removing itself from the fighting and focusing on mutilating itself. This behaviour is not observed in the other subjects. At 73 D-88634 stands up, all it's restraints have been losened and deconstructed. Now with free movement D-88634 walks up to D-345679 (female in his 60's with early osteoporosis). The D-Class proceeded to break her arm and stab it inot her throat. The bone was broken again to create a small knife which was used to stab the 7 other D-Class in the same manner. The manner of murder was calm and calculated and confirmed D-88634's immunity to SCP-923.
D-88634 was classified as SCP-4764 hencefourth.
Entry 9: Aftermath
SCP-4764 seems to rather dislike me. In one of our interviews it told me that it will kill me. Furthermore rummors about SCP-4764 among the D-Class are spreading. It's as if it became mythical creature to them. Further investigation into SCP-4764 have shown it to bilogically be a normal humn, except it's unusually underdevelopped brain which is not only very small, but lacks ridges.
But hey, at least I got promoted. With regards Doctor Janushovits.