Worldbuilding Ahoy! (Formerly the magic system thread)

...They're from Earth?

Sorry if I don't exactly understand your question, but Therans have been on Thera long before humans came into the picture. And humans have always been from Earth.

And it's just that humans brought their stuff with them Noah's ark style (except with mostly seeds and DNA than actual plants and animals.)

Or did you mean what organization the humans came from? Well, they're a colony ship out to answer Earth pressing concerns at that time.

That's a good question, tbh.

Well, the usual case is that a different mood means that something's distracting them from their task. So the tendency is that magic might not be as focused as it should be, and might cause some unintended consequences. If it's something like, being mad at the person being healed (like, say, the patient did something really stupid.) That probably won't affect it as much? The person is still focusing on the person and their wounds after all. (For the most part, it's probably a bit simpler than trying to feel protective all the time when you want to use dark powers. Magic's sorta in-tune with what you want to do more often than what you're feeling.)

Also, I kinda imagined that the gods (and the religions they were from), since they're tied to magic and their elements, always seemed to be somewhat practical in how they gave magic, since they were all patron deities of one or multiple professions and another. The gods were all culturally inclined, at the very least, that they wished for their charges to flourish in the environment they created and shared with them. Whether or not they might have been the type to seem like a mercurial or unfeeling god, they all granted the world a boon through the Mothercrystals.

Hrm, if you're panicking the magic would probably be unfocused. Therefore, you end up with something uncontrollable rather than a different element for most cases, at least unless the person sorta has something like muscle memory where they keep bringing up the same element in a panic rather than the element they intend to cast.

And how you describe the creation of a wall of fire is really how the elements would work. You use your earth sub-element to give the shape of your fire core element. And mixing emotions just gives you an indecisive element. Aka, Aether

Well, I wouldn't rule out final boss battles complete with spectacular light shows, but it's more likely going to be a collaborative effort if it ever happens.

As for locales, I can certainly say that floating islands are a thing. So are cities built on the sides of canyons and whole cities built on a giant tree. Expect lots of ruins and perhaps a few very odd locales due to magical shenanigans.

Oh yeah, I forgot Cosmos can also do stuff like bilocation and screwing around with gravity

...nobody has voices in their mind when they do magic. And I'll send you the prologue on a private message.