Supric
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Supric, a unique building that costs 10 crystals and is located in the third row of construction in a town. Click on the arrow, click again, and a window should pop up saying "Altar of Resurrection." I haven't tried using it myself yet, but I read about this building in the manual.
Or is it an upgrade?
Actually, it's not relevant to me; starting from the second week, I'm almost defeating everyone without any losses, but it's still good to know...