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One method to easily obtain this skill point is to use the Mining Vehicle near Angela's house. You can use it to easily dispatch Y.E.T.I.s and pick up moonstones. However, for the Arctic Leviathans, you will have to destroy them yourself or they will destroy the vehicle. In the event that you die, you will respawn next to Angela's house. If that happens, all you have to do is get in the vehicle again and get the rest of the moonstones. This method is much less effective in challenge mode, as the Y.E.T.I.s have much higher health and take more than one hit to kill.
A much more effective way to get the skill point is to wait until you begin challenge mode. With the Ultra Tesla Barrier, the Y.E.T.I.s will only take two hits before being defeated. This method prevents any huge amount of extended combat and gives you a much lower chance of death.
- Ratchet & Clank: Going Commando (first appearance)