Armor Enchantment: Mass I & II

An armor enchantment called Mass would be an nice idea. It has 2 level the same as normal knockback. It would only work with armor. (Mass will be incompatible with Blast Protection AND WILL NOT PROTECT AGAINST EXPLOSION KNOCKBACK). Mass I would give around 50% knockback reduction and Mass II would give around 75% knockback reduction. The reduction mainly applies to Melee Attacks, Punch Bow, Mobs with high Knockback. Also could protect against KB traps, but in other PvP methods like sword UHC and SMP this could create new strategies. Mass I on an single armor piece will start around 15% reduction, on 2 pieces around 25% reduction, on 3 pieces around 35% reduction, on 4 pieces would cap around 50% reduction max. Mass II on an single armor piece will start around 25% reduction, 2 pieces around 40% reduction, on 3 pieces around 60% reduction, on max pieces max around 75% reduction. Mass should be rare but not an really difficult enchant to obtain.