After story completion and obtaining a first Core Orb, the Forge unlocks Inherited Skill changes for weapons.
PC / Global, final content update through 2023 patches
WHERE & HOW TO FARM
Where to farm
The weapon Limit Break interface at the Forge after story completion and first Core Orb acquisition.
Inherited Skills can be changed through the weapon’s Limit Break interface once both prerequisites are met: finish the main story and acquire a first Core Orb. The May patch confirms this unlock condition. From there, inspect the weapon’s skill options and the materials displayed before committing. This is a customization step, not a farming route on its own: if the option is still locked, complete the progression gates first; if it is available, plan the material cost and make the desired change at the Forge.