- Not to be confused with Meryl Felstorm.
The Felstorm was a gigantic swirl of fel situated above the Tomb of Sargeras. In reality an enormous portal leading to the world of Argus, it was powered by a powerful source of magic beneath the Tomb that Gul'dan released, marking the beginning of the third invasion of the Burning Legion.
As the Felstorm darkened the skies above the Broken Isles, the Azerothian forces rallied to the Broken Shore in the hopes of countering the invading demonic army. High King Varian Wrynn and Banshee Queen Sylvanas Windrunner led the first wave of the Alliance and Horde's armies. Their incoming troops were prematurely assaulted by infernals and felbats pouring down from the Felstorm. The Battle for the Broken Shore eventually ended catastrophically with the mortal forces being forced to retreat.
- The other famous portals that the Legion previously used to get to Azeroth were the portal inside the Well of Eternity, the portal opened in Dalaran by Kel'Thuzad, the one in the Sunwell, and the Dark Portal.
- Flying into the Felstorm will kill the player in a couple seconds.