- Berserkers
- Saints
- Librarians/bibliothecaries
- Double headed god (god of doorways)
- Ghost sources
- Sentinels
- Two-person bonding
- Samurai
- Stepwells
- Pillars
- Elaborate roofing
- As above, so below
- Towers with people trapped in them
- Prisms and mirror tunnels to create light in buildings (see deck prisms)
Cultures to Research
- Iroquois Confederacy