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Dragonshard is a 2005 Dungeons & Dragons RTS based on the newly released Eberron setting. The setting of magical industry and the apocalyptic Last War are uniquely well suited out of all D&D to be turned into a strategy game.
The result was wildly experimental, blending together RTS and dungeon crawling gameplay in a fascinating way.
Unfortunately, those experiments mostly didn't work, and the game largely wastes Eberron as a setting.
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Check out the first Zoshbox video: https://www.youtube.com/watch?v=5cy_HNP8cIA&t=4s
Dungeon Masterpiece's video about Eberron Geopolitics: https://www.youtube.com/watch?v=Rqupzr2UxFQ