Heart Crystal increase the The Player's Maximum Health by 20 when consumed.

To consume a Heart Crystal, use the Interact action (default is ( e key+hold) or ( right click+hold) on PC).

Like Stamina Ups, Heart Crystals are unable to be sold.

Known Sources

Spoiler Warning

This page contains spoilers. View at your own discretion.

The only currently implemented method to obtain Heart Crystals is completing specific Story Quests. So far, the quests that reward The Player with a Heart Crystal are:

Fields of Mistria Navigation
Mechanics	Controls • Day Cycle • Friendship • Infusion • Inventory • Magic Spells • Maps • Marriage • Monsters • Shipping • The Player • Town Rank • Quests
Skills	Archaeology • Blacksmithing • Combat • Cooking • Farming • Fishing • Mining • Ranching • Woodcrafting
Animals	Barn	Alpaca • Cow • Horse • Sheep
Animals	Coop	Capybara • Chicken • Duck • Rabbit
Items	Animal Cosmetics • Animal Products • Artifacts • Blacksmithing • Bugs • Cooked Dishes • Cosmetics • Crops • Equipment • Fish • Forageables • Fruits • Furniture • Materials • Tools • Weapons
Characters	Bachelorettes	Adeline • Celine • Juniper • Reina • Valen
	Bachelors	Balor • Eiland • Hayden • March • Ryis
	Townsfolk	Dell • Dozy • Elsie • Errol • Hemlock • Holt • Henrietta • Josephine • Landen • Luc • Maple • Nora • Olric • Terithia
	Vendors	Darcy • Louis • Merri • Taliferro • Vera • Wheedle
	Special	Caldarus • Priestess
Atlas
Environment	Events ( Festivals • Friday Night at The Inn • Saturday Market ) • Seasons ( Spring • Summer • Fall • Winter ) • Weather
Locations
	The Player's Farm	Farmhouse
	Town	Balor's Wagon • Bathhouse • Blacksmith • Celine's Cottage • Clinic • General Store • Manor House • Mill • The Sleeping Dragon Inn
	The Narrows	Errol's Cabin • Horse Statue • The Mines ( Upper Mines • Tide Caverns • Deep Earth • Lava Caves ) • Museum ( Archaeology Wing • Fish Wing • Flora Wing • Insects Wing )
	The Western Ruins
	Sweetwater Farm	Chicken Statue • Hayden's Shop
	The Beach	Lighthouse • Tackle Shop
	The Eastern Road	Carpenter's Shop • Wishing Well
	The Summit
	The Deep Woods