Prime Materials: Bravura, a magic lute for D&D 5th Edition

BRAVURA
Wondrous item, rare (requires attunement)

You gain a +1 bonus to magical attack rolls and damage rolls with this magical lute and may substitute the spell's damage for thunder damage.

In addition, your spell save DC with enchantment spells increases by 1.

Bravura was a gift to the bard, Renyatta the Red, from high elven mystic known only as the Empress in Amber.  Renyatta had been instrumental in convincing the Empress's youngest daughter, Isolde of the Northern Star, to finally return home to Ivory Petal Island after nearly a century of life as an adventurer.