Glassteel

A highly advanced structural material formed by carbonizing iron in a diamondlike lattice. Gram for gram it is one of the hardest, toughest, most resilient materials known to man, though still inferior to Questonite. It has been speculated that Glassteel is one of the alloys used in Questonite, however.

The original formula was developed by Leros Industries in the early 2020s and confiscated by UNTIL. It became more broadly available in the 2040s and is now widely used in industrial and military applications, though it is far too expensive for most commercial uses.