Azarzhel, The Storm of Swords

Azharzhel terrorized the Sword Coast during the late 14th century DR, prompting Lady Tanamere, a member of Neverwinter's royal family, to rally two parties of adventurers to slay the dragon. While they succeeded in killing the Storm of Sword, four of the adventurers died in the fight, and Lady Tanamere herself succumbed to her wounds soon after. At her royal bidding, all of the fallen were laid to rest alongside Azharzhel's bones in a dragon-shaped barrow near the site of the battle.
By the late 15th century DR, most common folk seemed to have forgotten both Azharzhel's and Lady Tanamere's names, but some still recalled the legend of their battle and the location of their shared tomb. The tomb itself is avoided by travellers and strange lights have been reported in the area at night.