Found two instances of ?? level monsters in exploring the world. [spoiler]They are called Hallowed Knights and Blood of the Onyx. Both are found after going as deep underground as possible. One is rather close to the entry point of exploration. Just to the left of the first mob encounter, to down those stairs and you'll find the first batch.[/spoiler] I'm lvl 8 and when I encounter them, all of my attacks (primary, secondary, heavy, and super) only return "Immune" in orange letters instead of any damage numbers like all other battles. Even if this is because of the level difference, I would rather see their health only decrease by 5% after blowing all my big attacks instead of being prevented from doing any damage at all.