Does GM plate reduce all damage but not spell?

[mani]

Does it reduce elemental damage but not spell?
(ex: Dragon or Elemental's normal attack)

Or it just reduce only physical(normal) damages?

[Arret]

GM plate has to do with recovery time.

If you meant master plate, it depends on the attack type of the monster. If the default attack type is physical then it applies. I do not believe the default type of elementals is physical, but I do think the dragon melee is.