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While playing Callo, I dominate a region, and I have a nightmare token. The Nightmare and Faun are there. Can I put another nightmare token there and lock the region in the same turn?
Yes. The region is then locked, and Nightmare dies. Locking the region is triggered on these conditions: Callo dominates a region where there are two nightmare tokens, and the Faun is present. If these conditions are met, the region is automatically locked.