Twilight Bark

Twilight Bark is sold by Inscription vendors in the Shadowlands. It can also be mined from Phaedrum Deposits and Rich Phaedrum Deposits in Ardenweald. It is also a reward from the following missions:
 * Memory Error
 * Pride of the Forest
 * Seed Thieves

Enchanting

 * Enchanted Twilight Wand

Engineering

 * Bomb Bola Launcher
 * Precision Lifeforce Inverter

Inscription

 * Fae Revel Masque
 * Soul Keeper's Column
 * Soul Keeper's Spire

Leatherworking

 * Composite Crossbow (Shadowlands)

As a quest objective

 * Restock: Imported Dinnerware
 * Restock: My Favorite Table