Rolls attack points all the way around to zero again.”— In-game description
This wrench is the ultimate weapon of the "Wrench path" so it has very high stats. Its 5-hit combo is identical to the Sigma Breaker's, so its third attack will often miss unless the enemy has been knocked down. It can be annoying to defeat armored enemies because of its Smash stat, which should be at a very low value, a hammer is more suited for taking out these enemies, although you can still defeat most enemies easily with this massively overpowered tool. And as a ultimate weapon its Attack value will go up faster than normally (+3 instead of +2 for the first five levels).
You can only obtain this weapon with the build up, it cannot be invented or bought.
The Grade Zero a high-tier weapon (Tier 8) : it'll gain 6 Synthesis Points (SP) per level-up. It has a WHP of 90.