Nightmares Made Real

Greater Invocation; 5th
You can use nightmare terrain as the spell. In addition to the normal effect, all creatures within the area at the start of your turn take 1d6 points of damage if they do not succeed on Will saves to disbelieve the effect.
If you use this invocation a second time while a previous nightmares made real is still present, the previous effect ends.

Source: Complete Mage

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