The Radix was one of the five lacunae on Mirrodin. Originally, it appeared as a humming sphere of brilliant green metal, somewhere near the middle of the Tangle. It was a sacred burial ground where the elves buried their dead and erased unnatural magics and relics, because any person or object they left on the Radix eventually vanished, except one.
However, once Glissa tapped a large amount of mana to destroy the Kaldra Champion, a surge of green mana from Mirrodin's Mana Core discharged through the Radix and ascended to become Mirrodin's fifth moon, effectively destroying the Radix and forming the Green Lacuna its place. 
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