Not unlike many Bugbear warlords / bullies, Grol found he could intimidate a group from the Cragmaw Clan and establish a base in an abandoned castle inside the southern tip of Neverwinter Wood. He became haphazard and destructive and angered the Emerald Enclave, who assigned his removal to Reidoth - who passed this off on Our Party, who successfully took him down in the course of seeking to rescue the Rockseekers dwarven clan's eldest - Gundren. Grol had held the dwarf captive in response to an offered bounty by Nezznar Baenre (The Black Spider) - and loosely allied with the Redbrand Ruffians assembled by Iarno Albrek.
After his demise, his lieutenant, Targor Bloodsword took over the clan and castle and began a more respectful rule of the area.
(See also: wiki)