The Powers of the Realms
Armor: One category lighter, + 2 Dex mod, -5 Armor Check Penaltiy, -10% spell chance failure.
Weapon: Critical threat range +1 (applied last), ex. 19-20/x2 made w/Mithril and Keen becomes 17-20/x2 from Keen, and then 16-20/x2 from Mithril. Allows the use of Weapon Finesse.