The D&D movie's fat dragon Themberchaud has a massive backstory in

Who’s that fat dragon in Dungeons & Dragons: Honor Among Thieves? Why can’t he go anywhere without smashing things? Why is the Underdark deserted? The answers involve nearly 25 years of D&D lore. Let’s dig in.

Themberchaud, Forgotten Realms Wiki

This is a real, unedited screenshot from Dungeons and Dragons

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art] i drew an obese dragon from OoTA! : r/DnD

Dungeons & Dragons: Honor Among Thieves (2023) - The Fat Red

Fat Dragon

OC] [ART] I made a huge, realistic Themberchaud - the flabulous

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I made a huge, realistic Themberchaud - the flabulous ancient red

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