1-2

Mithral

If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn't.

3-4

Wolfram

While you're wearing this armor, any critical hit against you becomes a normal hit.

5

Vigorous

While wearing the magic item, your walking speed is increased by 20 feet.

6-7

Spiky

While wearing the magic item, a creature that hits you with a melee Attack while within 5 feet of you takes takes 4 piercing damage.

8-9

Protective

While wearing the magic item, bludgeoning, piercing, and slashing damage that you take from nonmagical weapons is reduced by 4. The damage reduction is halved for bludgeoning, piercing, and slashing damage that you take from magical weapons.

10

Prismatic

While wearing the magic item, acid, cold, fire, lightning, and thunder damage that you take is reduced by 4.