He traced the chain.
Link one. The survey. Year 460 AF. He had mapped the Morreth containment zone himself: an exhaustive geological and domain-resonance assessment of the entity's ambient field, the surrounding bedrock composition, and the structural integrity of the containment shell he had woven into the crust four centuries before that. The survey was precise. It reflected the entity's state at that moment with an accuracy no mortal instrument could approach. He had filed it, archived it, and authorized its use as the foundational reference for all future Morreth operations.
Four hundred and ninety years ago. The survey was his.
