What Peter Brown saw was a large figure of a ghost sitting cross-legged atop the ancient tomb. The ghost looked as he might have appeared in life, tall and clad in a military uniform from a bygone era. The uniform was unlike any Peter had ever seen on television, and he even spotted a helmet on the ghost's head. As it sat there, he noticed a long spear resting across its legs.
Upon closer inspection, Peter noticed that the ghost was drawing in the moonlight through its nostrils.
Spirit Ghost!
This thought suddenly sprang to his mind.
Only after examining his acquired inheritance did Peter understand that a Spirit Ghost was not an ordinary otherworldly entity. It was a ghost that had been nourished by Earth's Spirit Vein for centuries and possessed a certain level of spiritual wisdom and basic Cultivation abilities.
Another advantage of such Spirit Ghosts was that, if tamed, they could assist their masters.