A long, centipede-like monster that dwells underground; they can be found in some areas accessible with the Mogma Mitts. If they spot you, they’ll charge straight towards you. But if they miss and hit a wall, they’ll become stunned.
How to Defeat
Moldorms have a clearly defined weak spot: the glowing section of their tail. You must crawl towards their tail, without them noticing you, then attack by shaking your Wii remote, right Joy-Con or moving the right stick.
Each time you hit the weak spot, part of Moldorm’s body will be destroyed and its weak spot will move closer towards its head. It’ll then rush forward angrily, to create some distance from you. This will continue until Moldorm is completely destroyed.
If you enter Moldorm’s line of sight, its eyes will turn red and it’ll charge towards you at high speed. You can take advantage of this by luring it into a wall; when it hits the wall, it’ll be stunned for a while, giving you time to go around towards its tail.
Another thing to keep in mind: Moldorm can only move forwards. It won’t follow you or go in a direction that (eventually) leads to a dead end. So if you’re getting chased by Moldorm, try to use this knowledge to find a safe place to hide.