"Experience, yes. And enough certainty that a solution can be found, as it seems there are ways to purify your Soul Gem without relying on the devices of your world."

Elidibus points to the ring briefly as he mentions her Soul Gem, indicating he's well aware of what it is.

"What I and anyone who would be interested in creating a solution lack is knowledge." There is a pause. "That is what a large part of the cost will be. Knowledge you may wish to keep hidden. And truths you may not be aware of coming to light."