Increases the health of the bearer, allowing them to take more damage.
This charm is fragile, and will break if its bearer is killed.
This charm is quite potent, despite the fact that it breaks upon death. One way to make use of the charm is to only use it in situations where dying is unlikely, such as exploration, in tandem with survivability-increasing charms, while avoiding its use in boss battles, except for Dream Boss battles (as the charm will NOT break when dying in a dream). Another is to pause the game right before dying, quiting to the menu and reloading the game, which makes the charm viable even in boss battles.
It is strictly superior in effect to Lifeblood Heart - for the same charm cost, it provides two regular health points which can be healed by Focusing.
The obvious downside is that once broken, Leg Eater will only repair it for a price. Late-game, the Geo may not be much of an issue, but the trip will be.
Lastly, it should be noted that its drawback is completely negated in Steel Soul runs since the run is over upon death anyway, making Fragile Heart one of the most powerful and useful charms on a Steel Soul run.
How to Acquire
The Grimm Troupe Content
Once the player has summoned the Grimm Troupe, Divine becomes accessible in Dirtmouth. To get the unbreakable version of Fragile Heart, the player must equip it then when speaking to her, give it to her when prompted. She will eat the charm, then ask for 12000. Once the Geo is paid, she gives the player the unbreakable version of the Fragile Heart charm.