Hagraven Claw comes from the bird-like witches of the Reach. The in-game herbalist recommends buying them rather than collecting them yourself, which is fair advice. Fortify Enchanting is the star here, but Resist Magic and Fortify Barter are useful too.
Alchemy effects
The effects are listed in the order you discover them by eating the ingredient or using it in a potion. Two ingredients make a potion when they share at least one effect.
- Resist Magic – reduces the damage and effects of hostile magic for a while. Also on: Bleeding Crown, Chicken’s Egg, Crimson Nirnroot, Lavender, Nirnroot, Tundra Cotton, Void Salts, Wisp Wrappings.
- Lingering Damage Magicka – a poison effect that drains the target’s Magicka over time. Also on: Purple Mountain Flower, Swamp Fungal Pod, Torchbug Thorax, Wheat.
- Fortify Enchanting – makes the enchantments you create stronger – drink it before using the Arcane Enchanter. Also on: Blue Butterfly Wing, Snowberries, Spriggan Sap.
- Fortify Barter – gets you better prices from merchants for a short time. Also on: Butterfly Wing, Dragon’s Tongue, Tundra Cotton.
Tips and trivia
The Herbalist’s Guide mentions mixing it with Snowberries – they share Fortify Enchanting.
Values from the Skyrim game files (Skyrim.esm): base value 20 gold, weight 0.25.