Per 
Item #: SCP-XXXX
Object Class: Keter
Special Containment Procedures:
SCP-XXXX is to be kept in a air-tight storage locker in site ██. Tests can only be conducted by permission of Dr ██████. In the event of a containment breach, all surrounding areas are to be sealed and all staff that is in the sealed area are to only be retrieved if there is no infected nearby. If SCP-XXXX-1 are spotted, firearms and incendiary weapons are to be used. If SCP-XXXX breaches, all responding MTF units must wear gas masks.
Since incident SCP-XXXX-1 the containment procedures have been revised by order of 05-█. Read revised containment procedures here:
Description:
SCP-XXXX is a vial of what appears to be a inhaled gas that changes breathers into SCP-XXXX-1. SCP-XXXX-1 appears to retain some features of the original creature however it is covered in beige mutations that assist in combat or supporting other SCP-XXXX-1 instances in combat. If enough SCP-XXXX-1 instances exist they form SCP-XXXX-2 instances which appear to control SCP-XXXX-1 instances and are made out of the mutations that form on SCP-XXXX-1.
Once SCP-XXXX-2 reaches a certain mass, it appears to use the biomass it has accumulated to make pure biomass creatures know as SCP-XXXX-3. SCP-XXXX-3 seem to be more specialised role such as: ranged combat or a tank-like form.
Addendum SCP-XXXX-1:
Interview post incident SCP-XXXX-1:
*Interviewed:** MTF agent Cpl Johnathan sanders
Interviewer: Dr █████████
Foreword: N/A
<Begin Log, >
Dr █████████: So corporal Johnathan sanders, as far as I can confirm you are one of the
only MTF operatives to survive the breach of SCP-XXXX.
Cpl Johnathan sanders: Yeah doctor it was just chaos. I'm normally a collected individual but
those things. They broke me.
Dr █████████: Could you please recall the events that transpired.
Cpl Johnathan sanders: Alright. So once the breach started, our squad was the first squad to
go in. We had two flamethrowers so we could incinerate those damn
creatures. We made our way through the facility, only hearing faint
screams and gunfire. And then it started. Private ███████ was ripped
away into the darkness. We then saw them. We opened fire and we
killed a dozen or so until they were able to take serg and the flamers
away into the darkness. Oh god their screams. It sounded like pain but
also a giddy noise. I don't know what it was but it make it ten times worse.
Dr █████████: This was when second squad entered the facility.
Cpl Johnathan sanders: They should of came a few minutes quicker! The others in my squad
were ripped into the darkness. Just then. Just then did they come! Just
quick enough to burn the rest to hell.
Dr █████████: I would like to thank you for your time. Goodbye.
<End Log>
Closing Statement:
Around half a hour after the interview, a gunshot was hear from Cpl Johnathan sanders room. He had shot himself in the head.
