In addition to the rules presented in the Ultimate Campaign, there are other structures that can be purchased for your settlements.

Settlement Qualities

Great Library

The settlement is home to a well known and abundant library that attracts scholars from around the world,

Increase Lore +4. Add 1d8 major scrolls to available magic items.

Teleport Banned

The settlement has something that interferes with extradimensional travel. Spells like Teleport, Dimension Door, Gate, Shadow walk, and like spells simply do not function.

Decrease Spellcasting by 2