- 对于the breakable object found in The Crimson，参见Crimson Heart。
The 恶魔之心 is an 专家模式 消耗品 item from the 宝藏袋 dropped by the 血肉墙. It permanently gives the player a sixth accessory slot to use (while in an Expert Mode world). This effect does not stack and may only be used once per player. While not in Expert Mode, the slot will be disabled, removing the effect and appearance of any equipped item and preventing new items from being put into the slot, though an equipped accessory in this slot may still be removed.
- The Demon Heart is one of the few Expert Mode items that cannot be equipped in any accessory or equipment slots, the others being the 骨头手套 and the 3 parts needed to craft the 机械货车.
- It is also the only consumable Expert Mode exclusive item.
- 22.214.171.124：Fixed issue where you could get new characters with the 6th accessory slot unlocked.