What happened with Chult and Ubtao during 4e? Ubtao's gone, and Dendar the Night Serpent was released and became a god. How and why did those events transpire?
[RPG] What happened with Ubtao
forgotten-realmslorereligions-and-deities
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Best Answer
The 4e FR Campaign Guide is completely silent about the topics you raise. Neither Dendar, nor Ubtao appear in its index. To the extent that I could track, Dendar is mentioned only one time in name as a primordial, and one more time as simply the Night Serpent while the Shadow Epoch (before -35000DR) is discussed. The Shadow Epoch is also the only time we hear about Ubtao the Deceiver, as the traitor who sided with the elder gods against fellow primordials. 4e FR Player's Guide has nothing at all regarding these topics; I could not identify a single instance where their names appear at all.
The main things we know from these two 4e books is that Chult became a separate island of its own after the Spellplague and the merging of Abeir and Toril. Mezro turned into a pit that was being haunted by various undead.
The 5e Sword Coast Adventurer's Guide is also thin in terms of information regarding Chult. Sadly the Second Sundering has not restored Mezro, it is still described as a ruined city haunted by the undead. Ubtao is not mentioned in the book (does not appear in the index), and Dendar is only mentioned as one of the possible warlock patrons; and is described to be from the Far Realm of the Great Old Ones.
In short, I don't believe there are RAW answers to your question(s) in the campaign settings. Dendar does not appear to have been released though, and it has not become a deity.
Finally, according to the recent 5e adventure Tomb of Annihilation, (spoilers ahead):