Fable II Side Quests

To unlock this quest, you'll need to collect four sketch fragments from groups of assassins that try to kill you later in the game. These assassins dress in all black with bandanas around their heads. You can collect one sketch fragment from each of the following four areas: Bower Lake, Brightwood, Bandit Coast and Westcliff. When all four are collected, go to Brightwood to find the Assassins' Guild's hideout.

The glowing trail will lead you to the Forsaken Fortress in the southwest corner of Brightwood. Once in the fortress, expect to fight off countless assassins. Make your way north and follow the paths around until you encounter Darius, who likes to taunt you. He looks pretty normal but he teleports around, making him a bit difficult to elude. Thankfully, dying doesn't matter in this game and you can just kill him however quickly or slowly you choose.