Amulet of Spell Reflection

This amulet is a mithril chain with a tiger's eye gem. It has 4 charges and regains 1d4 daily at dawn.

You gain a +2 bonus to saving throws made to resist spells. 

When you are targeted by a spell, you can spend 1 charge from this amulet and use your reaction to try to reflect the spell back at its origin.  You must make an Intelligence, Wisdom, or Charisma check with a DC equal to 10 + the level of the spell. On a success, the spell is nullified and fails. If you succeed by 5 or more, the spell is reflected back on its origin, and the spellcaster becomes the target of their own spell.

Notes: Bonus: Saving Throws