Magic Reduction and Physical Armor

In most games released after 2007 that involved with medieval fantasy stuff had two kinds of attacks: Magical and Physical.

Magical attacks use mana and is usually very burst fire-y.

Physical attacks dont use anything and deals pretty presistant damage, no matter how long the fight has been.

The attacks are different, and so are the defences for them. Magical defence is usually called Reistance or Spell Resistance and most games has the defence set to 10% reduction. In some games, the physical defence is a strict number that subtracts onto the incoming physical damage value, where as in other games it is an inprovable percentage value whether directly or calcualted from an integer number.