In *Kingdom Come: Deliverance 2*, the side quest "Canker" becomes available after completing "The Jaunt." This quest is a great opportunity to acquire a mace or some extra Groschen, so let's walk through how to complete "Canker."
Pick Up the Canker Side Quest
Find and Kill Canker
The bandit camp where Canker resides is nestled in the mountains and can be tricky to find. You'll need to navigate through a narrow gap similar to the approach to the Hermit's house during the "Wedding Crashers" quest. Prepare for combat before entering, as you'll encounter a group of bandits along with Canker.
In the fight, some bandits might flee depending on the sequence of your attacks, but you must ensure most of them are defeated. Fortunately, Canker will not escape, allowing you to fulfill the quest's requirement by killing him.
Finish the Quest and Return to Gules
After defeating Canker and his comrades, loot Canker's body to find the Light Mace, which serves as proof of your success. Feel free to take any additional items you find valuable. With the mace in hand, return to Gules in Semine to complete the quest.
Upon completing "Canker," you'll need to wait a full in-game day before you can continue the storyline with Gules. After this period, speak with Gules again to pick up the next quest, "Handsome Charlie," involving another of his former bandit associates.