Aether Armor

This suit of armor (Medium or Heavy, but not hide) is reinforced with Aether, a material only found in the deepest and darkest corners of the outer and inner planes. While you're wearing it:

• Any critical hit against you forces the roll to be rolled again, and must use the new roll.
• Any hit against you that deals bonus force, radiant, necrotic, or psychic damage deals one less damage die of that otherworldly damage (minimum of 1).
• Once per day, when hit by force, radiant, necrotic, or psychic damage, gain immunity to their effects (such as spirit shroud) for one minute.
• You gain resistance to Force, Radiant, Necrotic, and Psychic damage from non-Aether weapon attacks.
• In addition, you have advantage on Intelligence, Wisdom, and Charisma saving throws. If you fail on those saving throws and take no damage, you instead gain a weaker version of the effect on a fail, if any (DM Choice).

This armor consists of a fitted metal chest piece worn with supple leather. Although it leaves the legs and arms relatively unprotected, this armor provides good protection for the wearer's vital organs while leaving the wearer relatively unencumbered.

Notes: Immunity: Critical Hits, Resistance: Force, Resistance: Radiant, Resistance: Necrotic, Resistance: Psychic, Advantage: Charisma Saving Throws, Advantage: Wisdom Saving Throws, Advantage: Intelligence Saving Throws