Mossy followed the party into the west chamber.

The room was actually mostly free of dust and spiderwebs. Flanking you were four very heavy looking stone doors, each engraved with a pony sitting peacefully, perhaps meditating. Crude holes had been bored into the center of these doors and this looked liked recent work. One door in particular had a large block of stone braced against it.

Mossy moved over and placed her hooves on the stone barricade.

"Is everyone interested in what the centaur kept locked away?"

Spoiler: Nessy
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While the empty doorways were large enough that the centaur or a similarly sized creature could pass through them by ducking, these heavy doors were far too small; they were barely big enough to admit a pony.