Lost in Madness presents a unique treasure hunt in Once Human. Finding the map is one thing, but finding the Cultist's Treasure is a challenge.
Once Human – Lost in Madness Quest Guide – Cultist Treasure Chest Location
While the Lost in Madness quest is listed as a level seven quest, this is very misleading as it is hardly one that a low level Once Human player can complete. It takes some detective work to figure out where to go to find the Cultist Treasure, and you have to find a specific map to start it. Even if you know where to go to complete this quest, make sure to start it and grab the Cultist Treasure map.
To start the Lost in Madness quest, you'll need to pick up the Cultist Treasure Map. The Cultist Treasure Map is located in the BN Store in the Coastside Plaza settlement in Dayton Wetlands, the starting area of Once Human.
Travel to Coastside Plaza and then look for the store on the east side of the main road that says BN Store. Inside, you'll first need to defeat and destroy an enemy spawner. Once that's done, head to the ominous looking ritual circle in the corner and interact with the red candle. After a brief trippy scene, a Cultist's Treasure chest will appear next to you, containing the Cultist Treasure card.