How the price adds up
Everything a card does is worth points, and each point costs half an ember.
Cost at each tier
This card is so cheap that no tier would lower its price, so it can't be upgraded. It always costs 1.
Other Scoria cards
The Murder-Holes
The Scarp
Third-Rampart Turret
Unbroken-Watch Keep
Volcanic-Wall Titan
Wall of the Long Siege
See all 48 on the Scoria page.