Below is a walkthrough on the Crystal White side quest in Dying Light 2 Stay Human. To obtain this quest, speak with Pierre on a building northeast of the Juniper Windmill in Garrison.
Find the chemist’s son
Travel to a Dark Hollow in the southwestern part of the Muddy Grounds. Deal with the enemies on the first floor then climb up the elevator shaft. Again, deal with the enemies on this level. Rook is tied up in a room lit by UV that you can reach by crouching under a half boarded door. When you speak with him, tell his father the truth of what happened to receive 500 Old World Money as part of the rewards.
Rewards
- 1500 Combat XP
- 1500 Parkour XP
- Regeneration Booster
- 500 Old World Money