Bracers of Deflection

Here's another item from Dragon Magazine issue #99's Treasure Trove II.  Originally by Michael Persinger, I changed it up a bit from his write up.  His version allowed a parry attempt that gave a -4 to your AC.  I based it off of the Battle Master parry maneuver, giving it the same d8 as the superiority die, but only giving it 3 uses per long rest, as opposed to the 4 per short or long rest that a Battle Master gets.

Bracers of Deflection

Bracers by Alyssa Ravenwood

Wondrous item, very rare, requires attunement

While you wear these bracers, you have a +3 bonus to your AC while you wear no armor and use no shield.

When another creature damages you with a melee attack, you can use your reaction and reduce the damage by the number you roll on a d8 + your Dexterity modifier.  You can use this power up to three times per long rest.