アイアンクラッド

A Cost 2 power card that adds 1 Energy (2 when upgraded) at the start of every turn, serving as a resource accelerator. In decks using X-cost cards (Whirlwind, Cascade), it raises the X value by 1-2 per turn and delivers explosive efficiency as time passes. Recovering the 2-cost investment takes at least 2 turns (1 turn when upgraded), but the return grows enormous in long fights. Playing it early completely transforms your mid-to-late game Energy pool. Even without X-cost cards, the extra Energy every turn massively expands your options.

Play it as early as possible to benefit from the Energy acceleration for as long as you can. Taking multiple copies (2 or more) causes Energy per turn to skyrocket, effectively making late-game Whirlwind or Skull Bash free. Combined with Whirlwind, a single Bonfire Spirits increases X by +1 each turn, so damage grows the longer the fight drags on. The 2-Energy investment early becomes worth 10+ Energy later. Upgraded, the 2 Energy per turn is a massive payoff.

• Whirlwind: An X-cost AoE. Bonfire Spirits raises the X ceiling each turn, enabling huge damage in long fights.
• Cascade: An X-cost skill that plays the top X cards of the draw pile. Bonfire Spirits' Energy acceleration lets it unfold many cards.
• Bloodletting: HP-for-Energy acceleration. Combined with Bonfire Spirits, you secure massive Energy in a single turn.
• Demon Form: A power that permanently increases Strength at turn start. The extra Energy from Bonfire Spirits makes this high-cost card playable.
• Offering: Lose 6 HP for 2 Energy and heavy draw. Combined with Bonfire Spirits, concentrate enormous resources into one turn.

• Ironclad Strength Build (Key Card) (S Tier)
• Ironclad Whirlwind Energy Build (Key Card) (S Tier)
• Ironclad Primal Power Build (B Tier)
• Ironclad HP Sacrifice Build (A Tier)