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
Bulwark of the First Wall
Bulwark-Holding Root
Chip of the Old Wall
Cold-Coast Tower
Fortify the Breach
Fortress Yard
See all 48 on the Scoria page.