Klarg

Klarg was a particularly fierce Bugbear and a sub-Captain of the Cragmaw Clan. He was given the charge of leader of the Goblins who established a base of operations at the Cragmaw Hideout, ambushing travelers using Triboar Trail and gathering supplies to be sent to the Cragmaw Castle. He was under direct orders to capture Gundren Rockseeker and Sildar Hallwinter, to obtain the map the Dwarf was carrying, and to send him along for further interrogation. He was free to do whatever he pleased with Sildar.
Klarg's operation was disrupted by the Owl Friends adventuring party who wreaked havoc at the hideout, killing Yeemik the Goblin and rescuing Sildar Hallwinter.
Klarg was able to escape, though he found the ball bearings trap laid by Sparky BaneDusk a slight annoyance.

He was then found moving supplies to Cragmaw Castle while at Klarg’s Campsite. The Owl Friends showed up yet again to disrupt his operation. He escaped after sacrificing Skritz the Goblin Sorcerer and a few of his fighters. This irritates Sparky BaneDusk to no end.
Update as of 17 Kythorn, 1491 DR.
Klarg, who's ultimate plan was to takeover the Cragmaw Clan, seized an opportunity to attack and kill King Grol. He ultimately failed in this task and was dispatched in the throne room of Cragmaw Castle. His ambition would be his undoing, and at long last, Sparky BaneDusk got his revenge.