On hit, Normal or Charged Attacks increase ATK and DEF by 4/4.5/5/5.5/6% for 6s. Max 4 stacks. Can only occur once every 0.3s.
In Game Description
An ancient longsword discovered in the Blackcliff Forge that cuts through rocks like a hot knife through butter.
How to get Prototype Rancour?
Obtainable from forging. Here’s all materials you need to forge Prototype Rancour:
Weapon Upgrade Materials
Here’s all material used to upgrade Prototype Rancour: