There exist two types of fictional power. In one, you show how your creation works and how it fits within the world. You don't need to explain everything. If you have a dragon, you can say it flies and breathes fire and your fans should accept it. But if you have your teleport across a continent, an ability not normal to dragons, then they are within their rights demanding an explanation. Or you can say your gunfighter is the fastest in the West. After all one must be the fastest, right? Now if your creation is something novel, like Cthulhu, you need to explain a little more. Cthulhu is huge, immortal, and has vast unknowable powers. "He is from another part of the universe." Then there is the other type of power, where you just invent stuff for comic or dramatic effect and don't justify it ever - like Dragonball Z and One Punch Man. Goku is unbeatable and his power isn't explained, because it's inexplicable and impossible. His ability to "yell so loud it breaks time warps" is just because ... he trained hard? It's on a par with defeating Hitler's blitzkrieg because you pulled out an UNO reverse card on the lead tank in the column. It's nonsensical and silly. Which is kind of the point. It's why we love stuff like One Punch Man. For reasons that are dumb and whiny (I blame myself), it bugs me when someone says "Goku could beat Dracula" or "Saitama could beat Cthulhu". I mean, I guess they could because that's how they're defined. But it's an entirely different way of looking at things. Yes Bugs Bunny could pants Cthulhu, so he'd have to bend over and pull up his shorts while Bugs hits Cthulhu on the head with a frying pan. But understand from which source your fictional power emerges. You can say "My gunfighter is the fastest in the West." without question. But you can't say "My gunfighter is so fast his bullets exceed the speed of light." without either just turning him into a joke or making a feeble attempt at justifying it. This is why the whole idea of wheelchairs in Star Trek or D&D is dumb. It is canon that the "wheelchair" problem has been FIXED in both universes. So you need to invent a reason for it NOT to be fixed. Such as when they said Kirk couldn't take the universal eyeball drug which meant he needed glasses for close-in work. Or Pike's body was so destroyed he would die in seconds without his support chair. Figh wizards, why can't you accept a wheelchair?" is on par with "You accept dragons, why can't you accept a Ford Shelby Mustang in your fantasy world." You CAN accept wheelchairs or, I guess Shelbys, but you must justify it becuase it is from beyond that world. Fight me.