The Amulet Keeper's War. Sorcery & Steel, #2

The aftermath of war brings its own challenges. Now charged with the safekeeping of one of the most powerful talismans ever created, Paladin Kele of Talman turns to her magic-wielding sister for help in better understanding the Amulet. But plenty of other parties want the Amulet of the Four for themselves, and they'll go to any lengths to procure it. Kele wants nothing to do with it, but the gods leave her little choice.
She can't let it fall into the hands of those who would misuse its vast power.