before the time of the Forgotten Realms 4th Edition campaign setting), the Weave collapsed and initiated the Spellplague, leading to several long-standing effects during 4th Edition: Realms that had been separated from Toril, the world of Faerûn, returned after millions of years of separation, including landforms from Abeir (a sister world to Toril) fusing with Toril, and the Feywild coming closer in proximity. A large part of Faerûn fell into the Underdark, draining the Sea of Fallen Stars and forming the Underchasm. Creatures touched by the Spellplague were hideously mutated into powerful monsters or spellscarred beings with special abilities. Some deities were slain. Most magical portals were rendered inert or malfunctioning. Items that permanently store magic and divine magic remained unchanged. The goddess Shar lost control of the Shadow Weave. The Second Sundering (the transition from 4th Edition to 5th Edition) separated Abeir and Toril. This undid the effects of the Spellplague which restored magic and the Weave to its pre-Spellplague state. Curtis D. Carbonell, in the book Dread Trident: Tabletop Role-Playing Games and the Modern Fantastic, highlighted the Sundering event as a lore explanation for game mechanic changes. He wrote: "A new sundering was needed to return FR to its pre-Spellplague state. Such complexities are often beyond the interest of many players, but those who choose to unravel them face a historiography and an archive-building challenge of great magnitude. The latest articulation of FR, though, provides a workable solution because it has adjusted itself through the editions, enough so that even 4e can be situated into the multiverse". Reception Mystra was #12 on The Gamer's 2020 "Dungeons And Dragons: 15 Most Powerful Gods, Ranked" list — the article states that "Mystra is more lawful than her predecessor, and in her reordering of magical law, she outlawed the use of all spells above 9th level, introduced limited access to magic (spell slots), and made spellcasting harder to perform in every way". Curtis D. Carbonell, in the book Dread Trident: Tabletop Role-Playing Games and the Modern Fantastic, highlighted that major events in the Forgotten Realms occur around Mystra's various deaths such as the fall of Netheril "because archmage Karsus attempts to become a god and kills Mystryl" who is then reincarnated into the first iteration of Mystra. Roughly 1400 years later, the Era of Upheaval ends due to the actions of "Shar, the dark goddess who covets Mystra's control of magic