Laws of Nature and Physics:
Laws of nature & physics are more-or-less the same as in the real world, although the conservation of energy and conservation of mass are a bit more flexible than in real life.
Magic revolves around the creation & manipulation of elements (fire, water, air, ground, flora). Only these elements can be manipulated, and they behave as they do in the real world.
It is an Earth-like world, but not an 'alternate Earth'.
Humans and Human-Like Species:
There are no completely human races, just the single human man who came through from Earth.The Druhlac, as a species, are the main human-like species in Rychilla. Within the Druhlac there are four races, who live in the different parts of the land, and they differ based on these environments – i.e. a Druhlac from the Ice Belt will have some evolutionary differences from a Druhlac from the mountains. This provides a diversity similar to that of Earth (Caucasian, Negroid, Mongoloid).