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The Ripper vibroblade is a melee weapon with a rotating chainblade. Some versions are powered by small energy cells, and can saw through people with relative ease.
A Ripper vibroblade. The chainblade rips and tears into its target. The version of Fallout 3 and Fallout: Brotherhood of Steel uses a power supply inside and thus doesn't require Small Energy Cells.
A bigger version of the Ripper. It's a two-handed weapon using a power supply inside and thus doesn't require Small Energy Cells.