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There appears to be a glitch with this skill point. After destroying the two towers on the Kerchu Fortress while on the pirate barge, you can climb off when it stops and keep making your way through the fortress until you reach the bridge (where the now-destroyed towers were located). Looking outwards, the third tower should be easily visible. If this tower is destroyed, the skill point is still given.
- Ratchet & Clank Future: Tools of Destruction (first appearance)