Rare Breeds display an alert message when encountered, and at the beginning of each turn another message will be displayed indicating that their shininess empowers them.
- Rare Breeds give out five times as much experience as their normal counterparts.
- In Etrian Odyssey IV, when starting a battle with a Rare Breed, you will gain 2 burst points. (However, if it escapes, you will lose 2 burst points).
- In Etrian Odyssey Untold and Etrian Odyssey 2 Untold, yoou are more likely to get Grimoire Chances and Grimoire Fevers while there is at least on Rare Breed.
- One medal on the Guild Card requires hunting a certain number of Rare Breeds. This could be considered necessary for 100% completion.