Irrefutable Robes

==Irrefutable Robes==
A simple robe woven with metallic threads, this robe asserts your will as it protects your flesh. 
Requirement: You must be able to cast at least one spell from the wizard's spell list.
Property: While wearing this robe, you enjoy the following benefits:
*You gain a +1 bonus to AC (stacks with mage armor when attuned)
*You gain a +1 Spell Casting bonus.
*You make savings throws against magical effects with advantage.
*Once a day as a free action while casting a spell, you can force creatures making saving throws against the your spell do so with disadvantage.
Rarity: Uncommon