[url]https://rpg.stackexchange.com/questions/41888/do-you-lose-your-prestige-class-features-when-you-no-longer-meet-its-requirement[/url
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The errata rules state that when two books contradict each other, the “primary source” wins; Complete Warrior and Complete Arcane are the primary sources for the prestige classes in that book, but the primary rules for the very concept of prestige classes in general is the DMG. So those books can establish an exception for themselves, but not globally. To do that would require a mention in the DMG errata file, which despite reprintings since Complete Warrior and Complete Arcane, has not happened. The DMG was not the only book to print prestige classes that play badly (as in, don't make sense) with this rule, either.