When the ancient city of magic vanished, there was much discussion about what happened to it and why it disappeared.
Philosophers opined that their power must have displeased the gods, and they destroyed the city in their wrath. They invented tales of tidal waves and volcanic eruptions to explain the missing city-state.
Time passed, and the world moved on. The city faded first into the mists of history, then the fog of legend. After a few centuries, nobody believed it had existed at all.
Which made their invasion when they phased back into this plane of existence all the easier.

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