Upon entering the Mustering Cave, you found that you were too late to help the Ranger Mundol. Amdir had mortally wounded him. Mundol asked that you carry a warning to Reniolind, a young Ranger scholar who is studying the ruins of the old Marshwater Fort.
Reniolind is somewhere within the Marshwater Fort, west of the Mustering Cave.
With his dying breath, the Ranger Mundol begged you to save Reniolind, another of his kindred, from Amdir's murderous rampage.
Defeat Amdir.
Amdir was hiding in the deepest depths of the ruins and struck down Reniolind, then turned his attention to you.
Amdir called forth a giant spider-queen before fleeing. Kill the spider and speak with the dying Ranger.
Reniolind lies dying on the floor of the caves.
Reniolind has shown you a secret path under the Midgewater Marshes in the caves beneath the ruins. At the end, you found Amdir waiting. Amdir mortally wounded Reniolind, then fled. The dying Ranger wishes to speak with you.