The Heart Crystal is a one-time 1/5 Drop from the Lava Alien in the Lava Dungeon and from the Skeleton Monks in the Castle Dungeon. Each one gives a permanent +5 increase to your Maximum Health, for a total of +10 from both Heart Crystals.
Common Drops 
| |
|---|---|
| Bones | Bones •  Ashes •  Ice Bones •  Fish Bones •  Bonemeal
|
| Feathers |  Feathers •  Fire Feathers •  Ice Feathers
|
| Skins and Furs |  Snakeskin •  Bear Fur •  Batskin •  Polar Bear Fur •  Black Silk
|
| Other |  String •  Thick String •  Seaweed •  Oysters •  Heart Crystal
|
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