Huracan

Huracan was the Aztec titan of storms. One of his cultists in New Orleans called Poppa Roq tried to perform a ritual that would summon him back into this plane of existence by providing Aimee with a powerful relic guitar that siphoned her divine energy into the summoning spell when she played it. In the end Aimee managed to counter the summoning spell while the rest of the party dealt with Huracan's cultist and his minions.