This quest is not available in game.
Find Dark Ranger Velonara.
Sometimes we must acknowledge the need to protect our allies so that they may protect us. This is one such occasion, <race>.
Travel to the Scarlet Monastery near the Undercity in Tirisfal Glades. Once you arrive, go to the Cathedral and speak with Dark Ranger Velonara. She is leading the final assault against the crusade there, and it would benefit us all greatly to ensure our undead allies secure the monastery before the crusaders have a chance to attack their capital.