There is a secret locked chest near a wrecked boat in Outward that requires you solve a riddle to open it. This Outward Sun Moon Stars Skull Fish Chest Riddle Guide will tell you how you can find the clue to the riddle and what the answer is so you can open the box.
Before both your friends leave the city you can speak with the guy at the beach inside the city. He will apologize for the wreckage and offer to compensate you if you find his special hidden chest near another wreckage a fair walk from town.
Outward Sun Moon Stars Skull Fish Chest Riddle GuideYou don’t need to speak with him to solve the riddle. Once you’ve found the chest, you can open it regardless of whether or not you have obtained the clues to the riddle. The solution is as follows.
First, Push the Moon, then, when the next option appears, choose the Stars. This will open the chest. There’s a dagger and some silver inside.