The heroes encounter Mauler after he decimated a traveling caravan. One of the guards informs the heroes that Mauler is the culprit, and that he's launching an attack on Arhynn with his Goblin Archer minions. The heroes battle Mauler in the Fire Pit, and they are tasked with defeating the Ettin before enough of his henchmen are able to escape through a secret tunnel.
The heroes succeed in their quest if Mauler is killed. However, if his minions are able to escape, Mauler leaves as well.
Mauler has the same abilities of a minion or master Ettin, but with 2 additional Health points per hero.