Demetrios1453
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Looks like we're starting to see some sneak peeks at Fizban's Treasury of Dragons in the run-up to this weekend's D&D event. This article gathers some Twitter posts by those who have some early access:
comicbook.com
Among other things, there are pictures of a red great wyrm, a moonstone dragon, the list of the 20 dragon types we'll get deep dives on, and a list of some very high CR creatures in the book's bestiary, including Aspects of Bahamut and Tiamat. Can't wait to see more previews this weekend!

Dungeons & Dragons Releases First Fizban's Treasury of Dragons Previews
Wizards of the Coast has organized its first preview of its next Dungeons & Dragons sourcebook. [...]
Among other things, there are pictures of a red great wyrm, a moonstone dragon, the list of the 20 dragon types we'll get deep dives on, and a list of some very high CR creatures in the book's bestiary, including Aspects of Bahamut and Tiamat. Can't wait to see more previews this weekend!