To track either of them, open up your quest list and look for them in the side quests section. This Skellige quest causes problems for a lot of players as it’s not immediately clear that it’s split into two separate missions, one to find Hjalmar and the other to help Cerys. Help Cerys unravel the riddle of Udalryk - The Witcher 3 Here's where you need to head to continue the quest to help Cerys in The Witcher 3. If you’re in this situation, this guide will help you continue the Brothers in Arms quest to help Cerys unravel the riddle of Udalryk. For some reason, this quest can be a little confusing and fail to let you know where you’re supposed to be heading. If you’re playing through the Witcher 3’s Skellige section, you’ll eventually pick up the Brothers in Arms quest and be tasked to “help Cerys unravel the riddle of Udalryk”.