Master of Protection [Armor]

Requires Medium Armor Master or Heavy Armor Master Feat

Whether you wear thick hide or full plate armor, you have
learned to use the hefty armor to your maximum advantage. You
gain the following benefits.
• You ignore half of the weight of the armor you’re wearing
for the purposes of encumberance.
• When you are subjected to an effect which would corrode,
rust, or otherwise damage your armor, you can use your
reaction to prevent it from being affected.
• When a creature scores a critical hit against you while
you are wearing medium or heavy armor, you can use your
reaction to cause it to become a normal hit against you.