The following Foundables can be found only by completing Fortress Challenges with an appropriate Runestone. Runestone type determines the type of reward you can get from completing the Challenge. Data collected by SerMorahJormont (/r/harrypotterwu).
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Care of Magical Creatures
 Puffskein |
 Hagrid’s Hut |
 Abraxan Winged Horse |
Dark Arts
 Knockturn Alley Sign |
 Tom Riddle Sr.’s Gravestone |
 Magic is Might Statue |
Hogwarts School
 Hogwarts House Cup |
 House Hourglasses |
 Owl Lecturn |
Legends of Hogwarts
 Flying Key |
 Wizard Chess Queen |
 Half-Blood Prince’s Copy of Advanced Potion Making |
Ministry of Magic
 Fountain of Magical Brethren |
Magizoology
 Murtlap |
 Thunderbird |
 Occamy |
Magical Games and Sports
 Quidditch Pitch Stands |
Mysterious Artefacts
 Sword of Gryffindor |
Wonders of the Wizarding World
None
Oddities
 Centaur Bow |
 Horned Serpent Egg |
Brilliant
 Brilliant Young Acromantula |
This page needs to be updated. Cursed Opal Necklace isn’t on here neither is the new Quidditch through the Ages book. Wonders – Hogwarts Express Engine & The Knight Bus… possibly others i am missing