The Void. It has no origin, it has little explanation. Care to speculate in the context of the show?
Well, we knew Naugus discovered it, or at least was the first to find it and live to tell about it. Also, Robotnik seemed to have an ability to control it; which is the reason why Him and Naugus had the uneasy partnership. Naugus was very interested in it, enough to risk his life on it and to trust Robotnik! He said in The Void episode that the crystals amplified his powers, which would explain it, but there was a price to pay, and we all know what that was.
Anyway, if I had to speculate what this void was, it was an extra-dimensional piece of space/time where all magic crystals possibly originated; perhaps this dimension is where 'magic' on Mobius comes from? Maybe the crystals are crystallized "magic power?"













