Each from a different reality and dimension of existence, each of these heroes are brought together by fate itself to defend it from old enemies with immense powers each capable of killing a god
There are ten different species of earth, and they all hate one another. So, when the gods get word of all the tyranny, they choose a representative from each species to travel together and retrieve each of their peoples artificats. After failing twice, they decide that if this group cant make it, that theyll seperate all the species for good.