A Monster Heart is the crystallization of a monster's essence. It holds the characteristics of a monster. When a person takes this heart to the Temple of Dharma, or an abbot or abbess from such a temple, the person can assume that monster's 'class' to acquire the qualities of said monster, eventually becoming it.
In Dragon Quest Monsters: Caravan Heart, two monster hearts are applied to a single monster when it goes through reform.
Acquiring Monster Hearts
A monster whose class can be undertaken has a rare chance of dropping a Monster Heart with the exception of two monsters:
The EvilMech will not drop an EvilMech Heart because it is only fought once in the game.
The Lucky Panel game in the Casino will sometimes have Monster Hearts as prizes.
Monster hearts may drop from any non-boss monster (and a few boss monsters, such as the gargoyle) shortly after acquiring the heart stealing device.
Obtainable Hearts in the Field
Certain hearts can be found in the world during the course of the games.
Dragon Quest VII
- A Lipsy Heart can be found in Probina Cave in the present. Another Lipsy Heart can be found in DarkDraco's Palace.
- A PlatKing Heart can obtained by exchanging 110 Tiny Medal to the Medal King.
Dragon Quest Monsters: Caravan Heart
- A golem heart can be found in Alefgard once the continent has been raised from the ocean, in the incredibly sparse ruins where Mercado once stood, referencing the monster's role in the original Dragon Quest.