Frontier Spire is Brave Frontier's tower climb mode. You battle your way through 100 floors of familar enemies and characters and you earn rewards after you clear every sector. The spire is broken up into 29 sectors and each sector requires 1 Frontier Hunter orb to enter. Frontier Spire will never run at the same time as Frontier Hunter so the orb usages will never clash. Difficulty gets harder as you climb higher. There is also no unit requirements or specific setups to do. Bring your best units and see how far you can climb!