Ghosts

A generic term referring to various types of immaterial and spiritual beings. Having no tangible body, ghosts remain bound to reality, either through magic, an exceptionally strong will (in the case of deceased creatures), or by many other unknown and mysterious means. Most ghosts are invisible or very hard to perceive. To get a glimpse of one, you need to be either in a proper environment, possess some kind of "spirit vision", or be dealing with a ghost willing to show itself. Some particular ghosts, such as spectres, are able to create tangible bodies through magical means. These bodies are usually fairly crude imitations of living bodies though, and even the most advanced imitation will be slighty transparent. A body is not a very important thing to a ghost anyway, and they usually use one only in order to better interact with living beings. If it is destroyed, the ghost can just create a new one. There is exceptions to that though and, ironically, some ghosts develop such a strong bond to a material body that destroying it affects the spirit so much that it vanishes from reality.

There are numerous creatures labeled as "ghosts", sometimes inaccurately. Some are extraordinary beautiful, while others are positively nightmarish; some are kind and friendly, gathering knowledge and helping others, while others are aggressive and dangerous, such as the dreaded labrisomes. Among adventurers, it is widely accepted that dealing with ghosts is a risky business. Some strange effects can occur from a simple contact with them, and some of them are predatory, having no qualms about consuming living prey. They would stalk their victim, then suddenly appear out of nowhere and swallow it whole, before returning to their immaterial state to digest it. Moreover, their bodies can't be harmed by any physical means aside from some rare enchanted weapons, making ghosts very dangerous and hard to kill. Oddly enough, although they are positively swimming in magic, ghosts appear to be rather average spellcasters themselves.