Sometimes, a fantasy story comes along that simply isn’t meant to be taken seriously. This is one of them.
Not to say that that’s a bad thing. On the contrary, it’s wonderful. Resenting the Hero happily mocks a number of fantasy standards, yet manages to avoid completely sacrificing its own story to do so. The plot is not mindblowing or anything, far from it, but it is well suited to the humorous type of story that Resenting the Hero is.