MarkB
Legend
Non-proficiency limits how well you can perform a number of tasks whilst wearing armour. If that's not a limitation, I don't know what is.GorTeX said:Mithral armor is only 'treated' as one category lighter for purposes of MOVEMENT and other LIMITATIONS.
You can wear armor if you are not proficient in it, so lacking proficiency is not a limitation.
Note that Mithral Full Plate of Speed has nothing about "movement and other limitations", the description says simply that it is considered medium armour.
Also, the Eberron Campaign Setting and other sourcebooks feature tables including category-adjusted armour, and they are listed under the categories they are treated as, not the categories of the base armour type (i.e. Darkleaf breastplate is listed as a light armour, and Darkleaf banded mail is listed as medium).