The fifth magic is... kinda useless

I was reading Mahoyo in japanese and it just dawned on me how Aoko is so restricted by the universe's laws that she literally cannot do anything

The 5th magic is almost entirely confirmed to be entropy manipulation. Which is absolutely broken, she would be able to rever the universe to be immortal and impossible to be damaged, she could recreate the physics laws so she could be the only supreme God of existence, she could revive everyone that has ever lived...

Buuut if she does that, she fucks the universe up, and more often than not the universe itself won't allow it. So basically her entropy manipulation becomes a very especific win con. Sometimes.

Literally the laws restrict her so much that any power is temporary and heavily constrained, as we see in her fight against the shiny star. This is probably why she adopted Soujuurou’s fighting style by Tsukihime. The fifth magic is simply not reliable enough to use it for fighting, and it provides benefits that are not worth its use.

The only thing she can do is... stopping aging? Im not sure if she actually does that but she can prevent cells from dying by using her entropy, since the chemical energy was already present within the body, but considering how the fifth is shown to work, its probably not even something intentional. Thats just a byproduct of having that shit with you

In fgo it is said Aoko doesnt understand how her magic works. And... no wonder. She can't use it. We see Soujuurou finding a better purpose for it than her, considering he literally uses it in his NP

Aoko got the short end of the stick lol