All or Nothing Armor

Armor (plate), rare

You gain a +1 bonus to your AC while wearing this armor, in addition to that provided by the armor. While wearing the armor, you have advantage on saving throws versus spells that would do damage to you.

Curse. If while wearing this armor, you fail a saving throw against a spell that would do damage to you, you take the maximum possible damage from that spell. The effect of this curse is not made clear with an identify spell.