Black Prison Castle.
In front of the inner fortress.
The rise of two suns brought light back to the Black Prison, tearing deep cracks into the earth's veins of this world. Magma flowed out of those fissures, painting patches of deep red on the desolate surface; malevolent energy poured out, marking many mottled black domains beyond the red.
The magic power born with the sun surged uncontrollably, dragging the crustal plates in pursuit of magic, causing shifts. This tore great holes in the once stable defensive magic array of the ancient castle.
The largest breach appeared in front of the inner fortress.
It was a wedge-shaped enclave, like a wedge, breaking the "eggshell" of the entire defense system, crossing two defensive magic arrays of the outer and main fortress in succession, forcibly embedding itself beneath the walls of the inner fortress from outside the castle.