Effect
When the attached card is played, the player gains a certain amount of Armor. As a Common-rarity gem, it is easy to obtain early in a run and helps build up a reliable defensive foundation. When combined with Shield Bash-type arcana that convert Armor into attack power, this gem enables an offensive and defensive hybrid strategy.
Unlock Condition
Automatically unlocked when the Blacksmith is unlocked and the Stardust Anvil is obtained. It is one of the starter Common gems available from the beginning.
Best Cards to Attach
Effective on any defensive card. Attaching it to shield or guard-type cards accelerates Armor accumulation. When using Shield Bash arcana, pairing this gem with shield cards creates a build where defense directly fuels offense.
Tier
Tier B — Provides consistent defensive value as a Common gem. Rises closer to Tier A when synergizing with Shield Bash arcana or Armor-focused builds.