User blog comment:JohnnyN64/Mysteries of Fairy Tail/@comment-24748439-20140611175023/@comment-24066070-20140611185540

These magics are very similar and have some vaguely established borders between them, in the end it comes down to what the author decides as the limits of each seperate magic.

Memory-Make should only be able to recreate something the user has seen at least once or something made up of two or more things the user has seen (i.e. the Frozen Lightning Blade). This magic likely can't create anything with a mind of its own (something which is actually "alive"), however there is Ur's statement that Make magic "has no limitations and can create anything". We'll just have to see how much truth that statement holds. I'm not sure if Memory-make can create something that was seen in dreams, however if the memory of said dream is preserved, it may be possible.

Arc of Embodiment is a magic which is based on inspiration rather than memory, so anyone using it can create anything that pops up in the mind. Here the discussion would be: where is the border between inspiration and memory? You could argue that as soon as you think of something, it also becomes a memory in your head, thus allowing Memory-Make to create it.

In my opinion both are a watered-down versions of Limitless Imagination, where the user manipulates reality according to his/her imagination. Such a power (and all its variations) is very tricky and is easily messed up, resulting in either an OP char or a bullshit char which lacks creativity and doesn't live up to its potential. So it's no surprise if an author messes up.

On a different note, I also assume Great Tree Arc and Green Magic to be the same magic.