Naldorese Plate Armor

Uncommon Heavy Armor (Plate)
Requires attunement

AC. 18 Naldorese Resilience. While attuned to this armor, your hit point maximum is increased by a number equal to your proficiency bonus Protector's Invocation. When a creature within 10ft. of you is the target of an attack, you can use your reaction to increase their AC by 1d4 until the end of their next turn. You can use this feature twice per long rest.