The Broken Glaive

 is a main quest in Torment: Tides of Numenera.

Synopsis
Casmeen and Mimeon told you that they don't know how to fix the resonance chamber, but they know it was built by a castoff. One of the two castoffs known to be in the city, a glaive named Riastrad, might be able to lead you to the chamber's builder.

Behind the scenes
Riastrad has been cut from the release version so this quest can't be triggered