Divinity: Original Sin Enhanced Edition

The second location after Cysila is Luculla Forest. There is a small town called Silverglane. Enter the tavern, go up to the second floor and in one of the rooms you find a skeleton demolitionist and the girl Bonnie, who asks you to save her (save just in case). Don't go into the room because it will explode, but just teleport it to the side or fill it with water. Save the girl, she will thank you, and the trophy is yours.