Dungeonosophy
Legend
The most recent teaser strongly points to an unexpected meta-setting...CHRONOMANCER. Besides the clear reference to a "Time Machine", note the partly obscured word in the upper right-hand corner of the photo:
(CHRON)OMANCER

Chronomancer was a one-shot book for AD&D2e which provided a time-travel meta-setting which did for the Demiplane of Time (aka the Temporal Prime) what Planescape and Spellljammer did for the planes and space. The lead designers were Leonard Coleman and Matt Forbeck.
Here's the book at DMs Guild, along with a good Product History written by Shannon Applecline: https://www.dmsguild.com/product/17442/Chronomancer-2e
There is an appendix in the book which outlines Chronomancy's ties to the main Official AD&D Worlds, such as Forgotten Realms and Dragonlance.
Yet an official web enhancement was subsequently released entitled "Chronomancy and the Multiverse 1.1". This gave even more examples of Chronomancy from Earth (of the Historical Reference Campaign), Greyhawk, Gamma World, Gothic Earth (of Masque of the Red Death), and Mystara.
Here's the web enhancement: http://pandius.com/chron.html
It makes sense for WotC to bring Chronomancer back for 5E. If it were combined with Planescape and Spelljammer, there'd be an uber-meta-setting capable of bringing PCs to any world and time in the D&D Multiverse. It could serve as the foundation for sort of time-and-space-travelling "Pathfinder Society" which spans the D&D Multiverse.
Even within the core 5E setting of Forgotten Realms, there are so many playable eras of Toril: before the Second Sundering, the Spellplague, and the Time of Troubles. These would all be wide open for exploration again.
What past and future times, in what worlds, would you like to visit?
Here are some examples:
The Arcane Age (Toril)
The War of the Lance (Krynn)
The Age of Might (Krynn) - the era of Istar, prior to the Cataclysm, which was explored in some novels and comics.
Age of Blackmoor (Mystara) - the home setting of D&D co-creator Dave Arneson
Greyhawk 2000 (Oerth) - basically "Greyhawk Modern".
A couple talking-points in regard to Chronomaner 5E:
1) Let's synchronize the worlds of the D&D Multiverse. With the release of 5E Chronomancy, it would be a good time to line up the timelines of the various D&D worlds, via a sort of "Grand History of the D&D Multiverse". There are research details here: https://sites.google.com/site/dndphilmont/timeline
2) A curious question arises: will the previous "rules-based" features of the Forgotten Realms, such as the Cavalier and Assassin classes from before the Time of Troubles, or the changes in spellcasting which occurred through the various "edition-change" cataclysms, be modeled using 5E rules? Or will it be totally hand-waved, as if the world was always depicted via 5E? The 2E Arcane Age product, set in Toril's ancient past, offered optional rules for modeling 1E features using 2E rules! Similarly, because the Saga card-based RPG system was used for one era of the World of Dragonlance, when this era was later depicted using 2E and 3E rules, some features of the Saga system were modeled via 2E and 3E, such as the Saga magic system. (For more about "game system realities" see: https://sites.google.com/site/dndphilmont/d-d-realities)
What would you like to see in a Chronomancer (+Planescape+Spelljammer) meta-setting?
(CHRON)OMANCER

Chronomancer was a one-shot book for AD&D2e which provided a time-travel meta-setting which did for the Demiplane of Time (aka the Temporal Prime) what Planescape and Spellljammer did for the planes and space. The lead designers were Leonard Coleman and Matt Forbeck.
Here's the book at DMs Guild, along with a good Product History written by Shannon Applecline: https://www.dmsguild.com/product/17442/Chronomancer-2e
There is an appendix in the book which outlines Chronomancy's ties to the main Official AD&D Worlds, such as Forgotten Realms and Dragonlance.
Yet an official web enhancement was subsequently released entitled "Chronomancy and the Multiverse 1.1". This gave even more examples of Chronomancy from Earth (of the Historical Reference Campaign), Greyhawk, Gamma World, Gothic Earth (of Masque of the Red Death), and Mystara.
Here's the web enhancement: http://pandius.com/chron.html
It makes sense for WotC to bring Chronomancer back for 5E. If it were combined with Planescape and Spelljammer, there'd be an uber-meta-setting capable of bringing PCs to any world and time in the D&D Multiverse. It could serve as the foundation for sort of time-and-space-travelling "Pathfinder Society" which spans the D&D Multiverse.
Even within the core 5E setting of Forgotten Realms, there are so many playable eras of Toril: before the Second Sundering, the Spellplague, and the Time of Troubles. These would all be wide open for exploration again.
What past and future times, in what worlds, would you like to visit?
Here are some examples:
The Arcane Age (Toril)
The War of the Lance (Krynn)
The Age of Might (Krynn) - the era of Istar, prior to the Cataclysm, which was explored in some novels and comics.
Age of Blackmoor (Mystara) - the home setting of D&D co-creator Dave Arneson
Greyhawk 2000 (Oerth) - basically "Greyhawk Modern".
A couple talking-points in regard to Chronomaner 5E:
1) Let's synchronize the worlds of the D&D Multiverse. With the release of 5E Chronomancy, it would be a good time to line up the timelines of the various D&D worlds, via a sort of "Grand History of the D&D Multiverse". There are research details here: https://sites.google.com/site/dndphilmont/timeline
2) A curious question arises: will the previous "rules-based" features of the Forgotten Realms, such as the Cavalier and Assassin classes from before the Time of Troubles, or the changes in spellcasting which occurred through the various "edition-change" cataclysms, be modeled using 5E rules? Or will it be totally hand-waved, as if the world was always depicted via 5E? The 2E Arcane Age product, set in Toril's ancient past, offered optional rules for modeling 1E features using 2E rules! Similarly, because the Saga card-based RPG system was used for one era of the World of Dragonlance, when this era was later depicted using 2E and 3E rules, some features of the Saga system were modeled via 2E and 3E, such as the Saga magic system. (For more about "game system realities" see: https://sites.google.com/site/dndphilmont/d-d-realities)
What would you like to see in a Chronomancer (+Planescape+Spelljammer) meta-setting?
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