A senior member of The Lords' Alliance, Sildar was dispatched to aid Gundren Rockseeker in his quest to reestablish the mines of Wave Echo Cave. The Alliance decided that the wealth generated by the mine would benefit the surrounding region, and so decided to invest in the dwarven venture. Sildar hired a group of adventurers to deliver a wagon full of supplies to Phandalin, before leaving ahead of them with Gundren on horseback.
Sildar and Gundren were captured by the Cragmaw Tribe on their way to Phandalin from Neverwinter. Sildar was kept in a nearby cave, to be eaten by the goblins. The adventurers rescued Sildar and escored him to Phandalin, where he remained to determine a course of action and coordinate with the Alliance.
Following Harbin Wester's bungling of the Redbrands situation, Sildar was elected as mayor of Phandalin, and secured further investment in the town from the Alliance.