The structure is surprisingly built for larger creatures. Perhaps the humans who built it preferred the use of horses or the like, as you traverse the halls you do find an indoor area more akin to what humans call a [i]Stable[i]. It looks like at one point it could have housed around forty horses in tight conditions. It was also equipped with an expansive loft for food, water and supplies for the horses. A well appears to be installed at its far end and the sound of flowing water reaches your ears the moment you approach it.
Whoever built this ruin had an eye for detail, but it's purpose was now lost to the ruin of time.
Other than the trapdoors and current sealed secret door, nothing else comes to your attention or threaten you all. All and all it was a drafty old ruin and you had the company of your fellow mercs...