Kagrenac

Kagrenac was High Priest and Chief Tonal Architect, or Magecrafter of the Dwemer. He built items known collectively as Kagrenac's Tools or the Profane Tools - three artifacts integral to accessing the divine power of the Heart of Lorkhan: Keening, Sunder, and Wraithguard.

Biography
Kagrenac was given the responsibility of using this heart to create the Numidium. However, his spell failed, and the Dwarves (as the Dwemer are sometimes known) disappeared, during the events of the War of the First Council. These events took place sometime between 1E 668 and 1E 700.