The Magic Hoard - Ring of Attunement

Been working on a rather uncooperative Operation Rogue Lion map (and have two more to go), but the magic item ideas just keep coming, so here's another treasure from the hoard....

Ring of Attunement: This ring provides the magic-user or illusionist with a +1 on saves vs. a particular type of magic (Alteration, Necromantic, etc.) and causes targets of such spells cast by the owner to save at -1 against the same type of magic. Additionally, it allows the owner to freely cast a 1st or 2nd level spell of the same type once per day. Experience Point Value: 2,000 G. P. Value: 10,000.