From Guild Wars 2 Wiki
Takes effect immediately upon receipt.
Hint: Defend the thorn wall against the Awakened attackers in Kourna, or regrow it.
— In-game description
- Protect the thorn wall from the Awakened or defend the thorn wall shapers while they repair the wall at the Front Line in the Domain of Kourna.
- Successfully completing either event will award the collection item.