If you set a value when creating/editing templates
9700 - 9900, there is a chance that it will spawn a Griffin Conservatory, a Cyclops Stockpile, or a Medusa Shed, a Crypt or a Naga Bank. It also spawns Imp Caches, a Dwarf Cottage, an Arena, and may spawn several level 6 dwellings. But I tested all of this on a very high density (500) )))
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