Easier to Ask Forgiveness Quest
You’ll receive some visitors in your throne room, and that will start a new quest where you’ll meet Linzi. You should talk with her in a tavern that is in the capital. Then go to the Swamp Witch’s Hut location. Open the map and on the right you’ll see a wagon with the dead horse. When you come there, kill or chase all the bandits away and collect all materials from the wagon. The quest is completed.