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Terraree, an Earthlike planet (image credit: Creation of the World - III by 
Mikalojus Konstantinas Čiurlionis)
Terraree means "Terra (Ree)" or "Ree's version of Terra".
Reality
Let's get this out of the way: Terraree is a personalized parallel Earth, right down to its name. As such, in any areas this page doesn't cover, it should be assumed to mirror the planet you're currently inhabiting.
The name "Terraree" exists for writer clarity and convenience. It is not used in-universe; Jaina Jade and others refer to her planet of origin as "Terra" or other synonyms.
Basics
Terrareen humans aren't the top of the food chain. They are stalked by a variety of large and toothy predators with a variety of tricks. Some can disguise themselves to avoid detection. Others can mesmerise people into forgetting they ever saw the beasts. A few are simply really damn durable, foregoing stealth in favour of extensive force. These predators are in turned hunted by Terraree's hidden hunter houses, a fact hidden from the vast majority of that world's inhabitants.
Magic is strained on Terraree. Spellcasters used to drawing on loose magic have a very difficult time casting anything there; mages of innate ability have somewhat better luck.
Denizens of this Terra
- House Jade (and the other Hunter Houses)
- Jaina Jade (origin)
- Pasht (origin and probable home)
- Cate Whitlen (probable)