Per 
Draft 1: Still needs more added to it but this is the bones:
SCP-29979 floats in a square rubber room, 10m thick, 3m high by 3m wide by 3m deep, surrounded by compound trans-129b – a translucent substance 10^9 the viscosity of pitch. SCP-29979 only remains stationary when compound trans-129b fluoresces. This requires 524hz light. Under normal conditions, SCP-29979 copies the colouring of its environment, however, when suspended in fluorescing trans-129b, it will not fluoresce, nor will it move. It matches the dimensions of a lymphocyte. When the fluorescing ceases, SCP-29979 vibrates erratically before accelerating to a velocity of 9.8m/s, increasing by a rate of 6.7m/s/s. This increase remains steady as the object collides with the walls of the room. The impact sounds like discordant tones sung by an underwater female choir. The volume increases with speed. When approaching the speed of light, the tones begin to harmonise. In 2xxx, at Facility xxxx, a transfixing sound drew all the researchers outside. They observed the exterior of the facility disintegrating. Only the author survived. Facility xxxx no longer exists. The object must not be allowed to move. The lights must be maintained 24/7. Attempts to control and weaponize SCP-29979 failed, resulting in temporary loss of SCP-29979, destruction of facilities and loss of life.
P.S the 'xxxx' ideally would be blacked out but I don't know how to do this yet.
