[Perception] Diminishing Returns affects your roll. You roll a 6 -1 (required 10). Failure.

You decide to explore under the arch. As you make your way into the darkness, Dawn Break uses her unicorn magic to ignite her horn with a purple glow, illuminating the area around you.

Moonflower: "Ooh, brighty!"

Dawn Break: "Sorry, Moonflower. We sunponies can't see as well as you do in the dark."

Moonflower: "Heehee! It's okay."

The magic light reveals an alcove, where you find a burnt campfire, and a couple of empty barrels sitting on a wooden platform by the far wall.

Sea Swirl: "Huh. No sweet loot in here."

Sweet Biscuit: "To be fair, this place isn't very well-hidden. If there was treasure here, the locals could've already beaten us to it."