堅實強化

Completely prevents the card from being destroyed by any source. Nullifies Destroy Gem effects, Red Death's destruction attacks, and any other card removal.

• Effect: Full immunity to card destruction
• Type: Protection Gem
• Stacking: One copy is fully sufficient

• Top finishers and key cards: Insurance that your most valuable card survives the entire run
• Return Gem key cards: Combined with Return, the card can never be removed from your hand rotation
• Evolved weapons: Protect the card you invested significant resources evolving

• Red Death encounter: The primary counter to Red Death's card destruction attacks
• Avoid pairing with Destroy Gem: Slotting both on the same card cancels each other out
• vs. Fire Proof Gem: Uncrackable is more universal — covers all destroy sources, not just burn

Approaches S Tier in contexts with card destruction threats. Essential protection for late-game runs where losing your finisher to Red Death would be catastrophic.