On Midsummer, when the goddess Mystra—who had spirited away a portion of her divine power in the realms, which she then recovered once the gods were cast from the heavens—attempted to pass him without the Tablets, she was turned back by the Watcher, and when she forcibly tried to pass the Watcher, he destroyed her with a catastrophic explosion in the skies above Castle Kilgrave, north of Arabel. Following Mystra's death, Helm shed a single tear that fell to Toril, but stopped before hitting ground. Hovering over the crater of destruction left below, the teardrop appeared as a magnificent gemstone, filled with the torment and guilt that Helm felt inside.
 
This action had enormous repercussions for Helm. Whilst it put off any of the other earthbound deities attempting the same action, it also caused the other deities and mortals alike to hold Helm in great contempt. Surprisingly, however, Helm's following remained strong in the south.
 
After the Time of Troubles ended and other gods were restored to their former existences, Helm himself was no longer bound to stand guard against them and much of his worship had faltered. The reputation of his clergy was made worse when the natives of recently discovered Maztica, whom the priests of Helm were subjugating in their conquest of the region, highlighted their cause.
 
Death

In 1384 DR, while conveying messages from Tyr to Tymora during the pair's courtship, a strange and fateful misunderstanding resulted in the accusation that Helm had stolen Tymora's heart. Helm was subsequently slain in a duel by Tyr. Cyric was suspected to have had a hand in these events.

 
The Heresy of the Threefold God, a belief held by the Eye of Justice maintained that Helm wasn't truly destroyed by Tyr, but rather had his divine essence merged into Tyr's upon his death.