Interplanar creatures are classed as beings which belong on no particular plane, but can be found on many different planes, or travel between them through various methods. Despite this one thing in common, they all have vastly different appearances and features, and behave in wildy different manners. Their purpose or mission is often strange and incomprehensible to the more mundane races.

Collectors

The Collectors are said to stem from the first thing the Gods threw away when making reality. Their purpose is to collect things that others have thrown away. While they are capable of travelling between planes, they typically reside in the spaces between planes which the Gods deigned not to use. Typically Collectors cannot use things that people still use or haven't thrown away. Their own language, for instance, is made up of old languages that have died out and phrases and words that have slipped out of usage. They are not only capable of collecting things, but also knowledge, emotions, souls and similar.

Collectors rarely share a common appearance as they are made up of the things they collect. Whenever a Collector decides to make a new Collector, they are made by things the previous Collector has collected and they may alter their appearance throughout their life. They carry the things in a space behind what one might consider their heads. Collectors are occasionally known as Phlogisii.

Crystalkin

The Crystalkin are a race of magically enhanced humans. According to their own tale, they are planar refugees after their crystalline home plane was destroyed, looking for a new plane on which to settle.

In appearance they are similar to humans, with small veins of crystal seen running along their body. They also tend to be taller and more slender than most other humans. Among their more common garb are cotton robes in pale blue or grey. Their magic bases itself heavily around the use of crystals, some of which they have incorporated into their own bodies, some of which they carry with them.

The Crystalkin are led, in their search, by their Queen, always the eldest female of the royal family of Dimari. Crystalkin can often be found exploring or searching for maps of inhabitable planes, their advanced magical skills allowing them to buy their passage.

Dertakers

Taking their name from an old joke saying that they are the opposite of Undertakers, the Dertakers fulfil an important task in the multiverse. The Dertakers are considered to be a particularly business minded lot, they do not speak to others except to conduct their strange business and ensure that it remains uninterrupted. Dertakers ensure that souls migrating between Realms are equipped with the proper bodies to deal with their new environments.

Dertakers all share a common characteristic, looking vaguely like a grey sheet draped over a body which is vaguely humanoid. Those adventurous enough to look under the sheets have reported that there is nothing under there.

Frigon

Frigon share some characteristic with dolphins, specifically their form. They chase through the planes, surviving on and having an uncanny ability to find reality gnats wherever they may occur. Frigons swim as easily through air as water, though their luminescent forms may be found most often in the Farther Realms, but may occasionally be observed elsewhere.

Mar

The Mar are often mistaken for demons, they shift between two shapes, one which is eerily reminiscent of a pale, overly chubby child, with pointy teeth and claws, the other is usually some manner of scavenging bird, usually equivalent of whatever is best suited for the environment in which they find themselves.

The Mar appear wherever there is a crisis, or a battle of large enough scope. Wherever there is enough loss of life, the Mar will eventually appear. The amount will usually vary depending on the size of the crisis in question.

Reality Gnats

Reality Gnats are usually more at home in the Farther Realms than elsewhere, they can be found on most planes though and are often mistaken for ghosts. Reality Gnats aren't so much creatures in their own right as breaches in reality, their entire being, to those who can sense them, often appears to be no more than a breath of colour on the wind.

Reality Gnats borrow intelligence from nearby creatures and may mimic them, instantly picking up languages, memories and similar but are rarely capable of putting it together in any kind of coherent way. Therefore they often mumble incoherent sentences (which are usually heard as a whisper) and generally take on almost transparent appearances from the memories of those around it.

Viators

Said to originate from some of the more peculiar planes, the Viators are explorers and occasionally traders. They find the environments in most planes hostile and travel in magical suits which protect them from the heavy air in these places. These magical suits often take an appearance similar to quicksilver and give little indication of the creatures beneath them. These suits change shape to fit the needs of the individual Viators, sometimes creating hands, feet or even mockeries of human shapes when they need to. However, no one knows what they look like beneath these suits as a rupture in the suit has always caused the living being inside them to implode.

The Viators travel the high skies of planes in their floating ships, as at home in the air as on the water. Communicating with them beyond the most basic has proved troublesome as their suits do not allow for telepathy or sound to penetrate and there is no common ground in terms of a written language.