Reforge in Nioh is the process by which you can reroll the different attributes of your Weapons in Armor. By selecting a specific attribute that you want to eliminate from the piece of equipment, the process will randomly selecting a new attribute to replace it from an available pool of possible attributes. This service is performed at the Blacksmith.
Melee Weapons have 8 exclusive pools and 1 non-exclusive pool. The non-exclusive bonuses can be a ***** to appear in any pool, and all or none can be present at one time. The non-exclusive pool is made up of: Break, Parry, Parry (Critical), Close Combat Attack, Ki Reduction (Critical) and Proficiency Bonus in addtion to the 8 exclusive pools which are listed below and only one of each pool can appear on a Weapon. Some Weapons come with fixed/locked bonuses that cannot be rerolled.
These values below are preliminary values, please edit the tables with any new higher values you encounter. White Text representing the max roll at 0 Familiarity, Blue Text Representing the max roll with max Familiarity.