“This Well,” Kelsier said, gesturing around him. “It’s like a plug. You created a prison for Ruin, but even the most solid of burrows must have an entrance. This is that entrance, sealed with your own power to keep him out, since you two are opposites.” “That . . .” Preservation said, trailing off. “That?” Kelsier prompted. “That’s utterly wrong.” Damn, Kelsier thought. He’d spent weeks on that theory.
