Singing sword

A singing sword was either a +1 greatsword, or a +3 bastard sword, made of silver, that sang constantly, and loudly, when drawn. They were specifically crafted for members of the Harpers.

Powers
The song of the singing sword increased the morale of its wielder, increasing their capabilities in combat and protecting them from mind-altering effects. The more powerfully-enchanted version of the weapon granted completely immunity from these effects, and caused the spell emotion to only incite rage within the wielder. The song could also induce a suggestion like effect in certain nearby creatures within earshot, cause shriekers to remain perfectly still and counteracted the songs of harpies. Despite the powers of the sword's song, they could be negated by a counter-harmony sung by a bard.

History
The goddess Eilistraee gifted twenty holy singing bastard swords to Qilue Veladorn and the drow of the Promenade of the Dark Maiden.