Prepare for Slay the Spire's Act 3 boss. Collect the Elite, Campfire, and Chest keys necessary to challenge the Heart and optimize your deck.
Before facing the Act 3 boss, ensure your deck is as strong as it can be. Use shops for final card removals or key relics. Upgrade any remaining high-stakes cards. If you're attempting to reach the Heart, you'll need to collect three specific keys throughout your run: one from an Elite, one from a Campfire, and one from a Chest. The Heart fight is an extreme test of your deck's resilience, requiring immense damage, block, and status management.
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