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The mention of the Tippyverse in the Dungeons and Dragons entry in Tabletop are misleading (it does use tactics such as Solar gating, but that isn't the main premise of the setting). I've made some adjustments to make it more in line with the creator's vision of the setting (see http://www.giantitp.com/forums/showthread.php?t=222007)
There is an entry for the Tevinter Imperium in Dragon Age Origins, and later an entry for the Tevinter Imperium in Dragon Age. Considering they're the same thing, this is a problem.
Deleted the newer entry.
How is the Government in the Bartimaeus Trilogy corrupt? Highly unfair to Muggles, certainly, and attempted overthrows every book, but I don't think any of the magicians were ever actually bribed succesfully.
I'm not sure the Empire from Star Wars counts. Even accepting Force-users as equivalent to wizards, the Emperor and Vader were the only "rulers". The Moffs who administrated and Admirals/Generals who led the armies were generally not Force-users, and the Emperor's Hands and similar groups were tools of the Emperor, nothing more. It's even implied in a number of books that once the Emperor became immortal, he was going to kill Vader. Magocracy requires more than one wizard. Most of the other times the Sith ruled counts, though.
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How well does it match the trope?