its not meaning literal, physical destruction of the entire realm, The Oni are just covering the realm in their cloud, the show literally says this, ur ignoring Wu's own words of saying this exact thing. As i said before, saying "Destroying x" means literally
NOTHING without inseries context or explanation. For example; character a is stated to destroy the world but he only destroys the surface of the planet; character b is stated to destroy the universe, but does so through their conquest of the universe by taking over planets. See how none of these statements mean anything, but internal context makes them mean something.
- Book of Elemental Powers doesn't contradict me, in fact it supports my point
- Given what we see of the Oni in the very next episode/season and nothing was physically destroyed when they were in their cloud, he's likely exaggerating
- This is a non point