Does it? Also, what is the highest possible armor rating?

Bump.

Armor does not resist spells. Regardless of how high your armor rating is, you can only reduce physical damage by 80% at most.

Once your armor rating is 567 you have hit the damage reduction cap that armor provides which is 80%, so why get more ?

Cool, thanks. How does The Lord guardian stone's resistances work? It says "50pts of damage resistance," is that calculated as armor?