This dimension is superficially based on the real world. There are cities, buildings, landforms, etc. parallel what we know as the modern, physical world, and time passes in generally the same way. If one were to drive on a highway or walk down a street, there would be people, cars, etc. moving about and activities taking place, so at first glance it is imperceptible from the real world. Physics and biology are as they are in the real world, except when they are not.
General, the dimension is vaguely Lovecraftian, and contains impossible architecture, abominations, apparitions, etc. though it might take the visitor some exposure before they interact with these unique features. Being that it is a dimension parallel to the one we inhabit, the people there are generally autonomous. When they encounter an anomaly, depending on the circumstances, they may react as though it were familiar and normal, or unfamiliar and interesting or frightening. Neutral anomalies such as subtle geographic distortions, duplicate items, etc. go unnoticed, but overtly strange or threatening ones will conjure a fairly predictable reaction.
The dimension appears to choose targets and manipulate their stimulus to guide them to areas, or to influence them to perform certain behaviors. Another phenomenon is the use of negative stimulus, such as a sudden illness, hallucinations, or visual distortions to push the target along their path. It is not known what is the ultimate consequence of failing to heed the stimulus are, but it's theorized that the dimension maintains a certain "draw distance" for the targets (or, possibly, all individuals) and it may force the given drawn environment for the individual/target to occupy different space. It is not known what ultimately happens to the targets/individuals -- whether they die, or reappear in a different location or dimension (such as with a wormhole).
Abominations, anomalies, and apparitions are the three basic classifications for distinct dimensional behavior, or deviations from the expected physical reality.
Abominations fall into two categories:
1 - Malevolent - threatening entity that has a reasonably perceptible motivation to destroy objects or people. It doesn't matter whether the malevolent abomination leaves the waste or somehow consumes it. Malevolent entities tend to lock onto a target and chase it until, either, they find the original target or locate a new one. Because they rarely show fear, or retreat, it is difficult to dispatch with a malevolent entity without outright destroying it
2 - Animalistic - this entity can be thought of as "neutral". While they can have a threatening appearance, they avoid confrontation unless, like a familiar animal, for the purpose of obtaining food (if the entity is "carnivorous") or defending itself. While animalistic abominations aren't outright hostile, they can be fearsome once provoked and will need to be handled in a similar manner to a malevolent entity unless it is one that can be scared away. The best practice is to avoid provoking one unless certain of either its behavior or one's means to destroy it
Anomalies are, in generic terms, instances where the Discontiguous Dimension physically deviates from the real world. It is impossible to describe every possible anomaly, though some examples include things like:
1 - Changes in physical architecture
2 - Instances of reference*
3 - Teleportation
4 - Subordinate dimensions**
5 - Deviations from known physical/biological laws
* "Instances of reference" describes a stimulus only meaningful to the target, placed with the possible, apparent goal of influencing behavior
** A "subordinate dimension" describes an area within the dimension which appears, to the observer, to be a separate dimension due to the concentration and/or intensity of the anomalies there. However, it is always tied, in one way or another, to the Discontiguous Dimension.
Apparitions are beings within the dimension which interact specifically with the target and may or may not be perceptible to other non-apparition individuals. Typically, the target will notice the apparition due to its familiarity. When it comes to apparitions and instances of reference, it's been observed that these two instances which draw on the target's subconscious. They may take the form of old items, expected items or information, or persons known to the target. This phenomenon suggests a conscious force with psychic abilities and sufficient awareness to plan and react to the target's own actions.