Briar Heart

Where to find

 * Looted or pickpocketed from Forsworn Briarhearts. If you choose to pickpocket their Briar Hearts, they will immediately die and a hole will appear in their chest because the Briar hearts is what is used to substitute a real Human Heart in the ritual in which they are created.

Restore Magicka

 * Creep Cluster
 * Dwarven Oil
 * Ectoplasm *
 * Elves Ear
 * Fire Salts
 * Frost Salts
 * Giant Lichen
 * Grass Pod
 * Human Flesh *
 * Moon Sugar
 * Mora Tapinella
 * Pearl *
 * Red Mountain Flower *
 * Taproot
 * Vampire Dust
 * White Cap

Fortify Block

 * Bleeding Crown
 * Honeycomb
 * Pearl *
 * Slaughterfish Scales
 * Tundra Cotton *

Paralysis

 * Canis Root
 * Human Flesh *
 * Imp Stool
 * Swamp Fungal Pod

Fortify Magicka

 * Ectoplasm *
 * Histcarp
 * Jazbay Grapes
 * Red Mountain Flower *
 * Tundra Cotton *
 * Void Salts

* noted multiple effects

Trivia

 * If a Forsworn Briarheart's Briar Heart is stolen through pickpocketing, he will drop dead with a gaping hole in his chest.
 * There are cases of a Briar Heart that multiplies itself, a player can carry around 400-500 Briar Heart without knowing it.(note needs validation)
 * Briar hearts are hearts given to the Forsworn from the Hags (Hagravens), which makes them immensly stronger, although this makes them lose their own heart to the Hags.

Вересковое сердце (Skyrim)