Greenstone amulet

Greenstone amulets were rare, extremely valuable magical necklaces that offered protection against a wide range of mind-controlling and physically dominating spells. They appeared as fist-sized stones, made of brittle greenstone, that shone with a radiance when activated.

Powers
When worn, these amulets offered a spell immunity-like affect to the wearers, granting immunity to the spells chaos, geas, hold person, hypnotism, mass charm, mind blank, quest, score and sleep. It also offered more-limited protection against fumble, maze, Otto's irresistible dance, ray of enfeeblement and trip, as well as certain psionic abilities. Greenstone amulets could only protect the wearer from a certain number and intensity of spells before it was completely drained, after which it shone extremely brightly and then slowly faded a dark hue. It would slowly recharge after this occurrence.

Appearances

 * Baldur's Gate: Tales of the Sword Coast