Talk:Grimm/@comment-125.238.174.45-20180414115006/@comment-4010415-20180414134437

Pyrrha didn't say "Grimm can't/don't use their Semblance." She literally outright said "The monsters we fight lack a soul." They have technology that allows them to measure Aura, which is energy that comes from the soul. Raven said the reason Cinder's Grimm arm got impaled by glass is because Aura can't protect Grimm. There may be something about Grimm anatomy or what the Grimm are made of that's anti-Aura in some way.