@Gargoyle Well you don't have to know the people to vote, just look at their profiles, however no doubt questions about hajime's and yue's abilities will come up, so i will explain them.
First i will explain the main magics in the series, called age of god magics. The age of god magics are creation magic, the ability to add special properties to minerals, gravity magic, the ability to manipulate gravity, space magic, the ability to bend space and teleport, spirit magic, the ability to interfere with souls, metamorphosis magic, the ability to remake normal organisms into obedient monsters, sublimation magic, the ability to evolve everything, and reproduction magic, the ability to return things to a prior state.
Those magics though are just limited applications of the real magics. creation magic isn't just the ability to add special properties to minerals, but the ability to interfere with inorganic material, gravity magic isn't just the ability to manipulate gravity, but the ability to use a stars gravity and even create black holes, space magic isn't just the ability to bend space and teleport but the ability to manipulates things at a boundary, spirit magic doesn't just allow the user to interfere with the soul, but also can interfere with things like energy inside the body of a person such as: heat, electricity, thought, consciousness, and memory. Metamorphosis magic is magic that allows the user to interfere with organic material, sublimation magic allows the user to interfere with the information of an object, and reproduction magic allows the user to interfere with time.
Not everyone is able to use the full extent of the abilities, so hajime can't use all of those, at least haven't seen him do it yet. What he can use is information manipulation as he used it to manipulate the internet on a global scale so that no one would be able to discover his identity after he single-handedly wiped out a terrorist organization. Most likely can use the full extent of creation magic as well cause as a transmuter that's what he is good at.
Yue can use spirit magic fully it seems, as she can manipulate the mind and memory and souls.
Anyway on to concept magic, concept magic is the magical manifestation of how magic acts in this world. To create a concept, they need to raise up their wish, for example the crystal key which had the concept "I want to return home", using spirit magic and sublimation magic until concept level, then they need to grant it magic power and forcefully materialize it. Concept magic is invented by utmost will, not theory. In concept magic the user needs the purpose of that time as the base, so just because it succeeded to be used once doesn't mean in the next times from then on it would be stable to use. Normally it becomes a magic that is just a onetime use.
So what this means is they can create concepts but it's based on the purpose at the time and is usually a one time thing. If you still need the purpose, you can still use the concept, for example yue and hajime created the crystal key to open a gate to return back to hajime's world, that crystal key was destroyed by ehito, but they created it again later because they still had that strong desire to return.
Hajime also created a concept "Deny All Existences" after yue was taken from him, His mindset was that he wouldn't accept the worth of existence without yue being there, hence the concept magic. He lost it after the people around him convinced him existence did have worth and he would be able to save yue. So the chain which had the concept in it fell apart and he was only able to make a single bullet with the concept in it, which he used against ehito. Just like the crytal key, it would be logical to say if he had that strong desire to deny all existence again he could use the magic again.
Similarly yue and hajime created a concept "The Scattered Pains Right Back Towards You", and this was created when they were literally out of magic power and then used another concept magic to get back some magic power, but definetly they weren't back to full strength. Anyway this is a concept they created just cause they wanted to kill ehito, don't see why they couldn't used that again if they wanted to kill someone else.