This sourcebook is Legends of the Twins, also for 3rd Edition. I actually wrote up a review of it nearly 3 years ago. In addition to presenting campaign ideas in various eras of the "main timeline," it also had alternate timelines where history proceeded differently. The one MonsterEnvy is talking about is Kingpriest Ascendant, where he succeeds in overcoming the gods of Krynn and attaining godhood himself. The other 5 timelines include the Heroes of the Lance losing, the Orders of High Sorcery helping rebuild Krynn after the Cataclysm and form a continental magocracy, one where the world is ending due to Raistlin killing off the gods, one where a supernatural winter falls over Krynn and the Knights of Takhisis create corrupted dragonlances, and one where the Second Cataclysm doesn't happen and Takhisis doesn't steal the world away. This last one, the Age of Dragons, is actually quite popular among the Dragonlance fandom. Not only does it not cheapen the original Cataclysm and War of the Lance by throwing yet another "fate of the world hangs in the balance" plot, it also is more of a "cold war" with political intrigue between the nations who settled in an uneasy peace.
When it comes to gaming, most Dragonlance players are familiar with one of two eras: either the original Chronicles which spanned an epic fantasy against a dragon-themed evil empire, or the Fifth Age which detailed events fifty years after the former. But a new trilogy of books revolving around...
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