Sildar Hallwinter is a renowned fighter and hero. He is also a kindhearted human warrior of nearly fifty years who holds a place of honor in the famous griffon cavalry of the great city of Waterdeep, during which time he flew with his famed griffon mount--Clavendiel--who unfortunately died during a failed siege of Waterdeep. After Clavendiel's passing Sildar now a member and agent of the Lord's Alliance began fulfilling the Alliance's goal of ensuring safety, security and prosperity of all cities and settlements by proactively eliminating threats through any means, while bringing honor and glory to their leaders and homelands.
Sildar met Gundren Rockseeker in Neverwinter and agreed to accompany him back to Phandalin--Sildar had hoped to investigate the fate of Iarno Albrek, a human wizard and fellow member of the Lords Alliance who disappeared shortly after arriving in Phandalin.
Unfortunately Sildar and Gundred were blindsided and Sildar was dragged off to a goblin encampment where he was held hostage before being freed by Lilith and Cody. Sildar escorted the two of them to Phandalin where he began to rest at Barthen's Provisions, a local store in the city.
When Sildar saw Lilith fighting Redbrand Ruffians in the street he decided to follow her and was able to save her as she almost died while being attacked by a rove of goblins in the caverns beneath Tresendar Manor.
later after Lilith had healed they returned and cleared out the ruinous caverns finding a helpful goblin named Droop. Continuing through the stone chambers of the secret hive of villainy they found it to be headed by Iarno Albrek to the shock of Sildar. Lilith and Sildar brought him to his knees and Sildar has headed back to the Lord's Alliance so that Iarno could face judgement for his foul misdeeds.