Vid's Family House Wiki
 An Angeil Tenebrae's armor: This armor has tightly woven threads of 
something  called, Nevermore, which is a metal that will not melt 
to plasma or anything that humans have (but the Light weapons, which 
only Helenna has. If you get one it will blow up)and the same thing 
(but shinier) in the hemlet. The face plate is one of the few places
that plasma can melt, but only to plasma.