Sergeant Mossfists is a goblin sergeant from Goblin Village, and the strongest and most powerful warrior loyal to General Bentnoze there, having a combat level of 51 (though he is unattackable). He and his rival, Sergeant Slimetoes, can be found and interacted with only during Another Slice of H.A.M..
During the quest, they help the player get to the H.A.M. tunnel to free Zanik, who has been captured by the H.A.M. agent Sigmund. Mossfists, along with Slimetoes, help the player by distracting the guards and allowing them to sneak past.