(I don't know the DreamSMP storyline well. If there are any mistakes, just pretend it's cause it's an alternate universe and not because I haven't fully watched the DreamSMP)
(Personalities may not be 100% accurate to the actual smp. Again, have barely watched the DreamSMP.)
There was a little known virus, but it was very harmful. It was a time virus known as XD, and it could take over bodies of the dead and completely control them. The bodies would still grow and no rot or decay would be present.
The XD virus had no clear goal. It wouldn't try to spread or multiple, but rather it would hurt anyone it could and break a person down little by little. Perhaps it was because it was a time virus, a concept not well understood.
One boy knows the effects of the virus well, very well. When he was 10 years old, he attempted to jump off a cliff and end himself. While the attempt was successful, his small body became victim to the XD virus.
This little boy is named Clay, though when alive and on the streets people called him Dream. The son of Schlatt and brother to Tubbo, his fate is unknown. The others hate Dream, but Clay is no longer Dream. The ghost of a little boy wanders.
[This idea was made by GlitchyEx3 and Luna9911, go check them out cause their both amazing]