MTG Wiki
Cave of Light
Plane New Phyrexia

The Cave of Light is another name for the White Lacuna, one of a series of tunnels that leads to the center of Mirrodin. The lacunas were created by the rising of the five suns from the Mana Core, a large ball of mana in the very center of the plane. Both the leonin and the Auriok held it as a holy place of divine revelation.