The Leviathan Flail was the upgraded form of the Scorpion Flail. When using a jump-strike with the Leviathan Flail, it released a shockwave, similar to the Quantum Whip's shockwave strike, except far more powerful. It was easily the most powerful (and only, not counting Ratchet's wrench) melee weapon in Deadlocked. This weapon was first used by Quaternion X who called it "the old ball and chain." It was described to have the ability to crush small asteroids in one swing. The Mega Leviathan Flail was bought for 1,000,000 bolts. The weapon could clear a screen of enemies in few seconds.
- Ratchet: Deadlocked (first appearance)