Gemworlds in the Endless Empire (Although technically, there are also ships and stations with the 'Gemworld' tag) are planets that have either been hollowed out, or artificially constructed. Inside are massive reactor complexes, complex support equipment, and Delacroix drives capable of generating a reality warping field. Inside of this field, the laws of physics can be altered to fairly arbitrary specifications. Before ever entering a Gemworld, you'd do well to read the bulletin that describes how reality is different - although most of them are fairly congruent to normal space, there are some equivalents of art pieces that have deeper differences, such as applying non-euclidean geometry to space. Existence gets weird when the shortest distance between two points is no longer a straight line.
Most however, follow the same rules as everywhere else, with just the addition of a second set. A set of rules allowing for Magic. Although there are several different magical systems, there is somewhat of a standard between them - magic typically works roughly the same way on every Gemworld with magic. These worlds typically have cultures and systems built with the magic as an integral part of it, although to offset it from the otherwise technological Endless Empire the cultures often (although not always) have a more... rustic appearance and lifestyle.
The best Magic was that you could feel... on your fur, in the air you breathe, in the soil you touch... and when Poly first stepped foot on a Gemworld, she could feel it. She could feel the power latent in the air, teasingly present, just out of reach. But a promise of potential. And so Poly found archives, and studied. Although Poly would never claim to be a hard worker (Well, maybe she would claim...) she had talent. Perhaps that made her more of a sorceress than a respected wielder of magic, but in any case... while she was here...
Magic was cool, and she was going to have fun. Time for adventures!