Young Writers Society

So, I'll focus on a few things here, since as Swordsman said, only athletic-oriented powers would fit the SB.

2) It actually depends on both the creator of the power and the world around the person that has this power. If we live in a world where "items hold the memories of the places they're brought to", for example, then you can use a power that allows you to access the memories of random items of random places. But then you'd have to ask Hiraeth directly if that fits the world of Children of the Sky. It would be useful, but not necessarily fitting. Nervous system aside, to have a soul, you'd have to be a living being — and objects are not living beings. So, yeah, that would be magical in nature, which is completely fine! But again, it's better if it fits.

3) Well, y'see, limits are a part of a creator's imagination. Here's the reason I'm saying that:

The Infinite Tsukuyomi is an illusion technique that, when used, takes the entire world, as in, an entire planet inside of an illusion and basically no one can come out since it's their life energy that's used as fuel for the illusion to continue. So, technically, as long as people are alive, the spell doesn't stop, and everyone is falsely happy because they all live in a different illusion of their making.

Now, the guy that made this didn't add limits just because "I have to be realistic", no, it's because if there was no limit, this power would be unbeatable. If we have just "making illusions", you could do something like that, and then create illusions powerful enough to basically just hold every enemy in place; then there's no conflict, no battle and no stress for anyone.
Infinite Tsukuyomi, however, is a spell that takes a lot of time, effort and conditions to activate.
So, again: if you'd like to make illusions, what limits would you place? Because no, not all types of illusions are overwhelming to the same degree. Some of them are only auditory. Others are sensory. Others affect only the eyes or the taste. Others are touch-oriented, and others still affect your pain receptors. Not all illusions last the same amount of time, too. Heck, some illusions can even alter your perception of time or space.

So, yeah! Making illusions. How? With your character's eyes? With his shield? By touching people? Then, what does it affect? And what effects does it have on both victims and user?

5) Now, I gave the Sharingan example because that limitation (trauma of loss) is linked to a world where most characters are ninjas. So, you're likely to experience that kind of trauma. Combining eye-related powers to random side-effects (like optic blast + trauma of loss), however, doesn't necessarily make them work.