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Sonic Assassin was a skill point in A Crack in Time. It was acquired by firing the Sonic Eruptor fifty times with the Xenegote's lungs completely filled. Use the Sonic Eruptor as Ratchet's primary weapon, and whenever a group of enemies was seen, the lungs were attacked when they were full. By training everywhere from moons to the arena, you could get this skill point.
- Ratchet & Clank Future: A Crack in Time (first appearance)