Opera:
It must have happened when the Island in the Sky fell. When it crashed, during that tiny window of time, Magmeld was covered in darkness. Slaski says that the Seed of Darkness, which was deep beneath Magmeld, sprouted!
I'm not sure what that means, but Slaski is so smart! He knows all sorts of things, so it must be true!
"Tell me about the Seed of Darkness."