Old Wharf at Oquilla's Eye

There is an old abandoned wharf at Oquilla's Eye. The Old Moon guild, who claim to have first discovered Oquilla's Eye, said they did not build it. The design of the wharf does not correlate with that of the natives' architecture. Could it have been the Vell? No, they came, slaughtered the natives, and left in a hurry after claiming the monster. So who then built this wharf? Perhaps there was another visitor who was there before the Old Moon guild arrived.