Im not sure if anyone else knows this but after mastering something you can add a 4th perk but you must have a purified token which you get from doing cursed gear. :
Ghost of tsushima - examples of purifying cursed items [tutorial link in descriptions] - YouTube
This one is really cursed! How can I purify it if it doesn't make any damage to foes? : r/gotlegends
Ghost of Tsushima: Legends, la versione standalone ha una data d'uscita
Tengu Demon | Ghost of Tsushima Wiki | Fandom
Ghost of Tsushima - how-to: curses and purification (must be completed on gold or higher only) - YouTube
The Complete Cursed Gear & Purification Ritual Guide - Ghost of Tsushima: Legends - LaggyGaming
How to Purify Cursed Gear & Understanding Gear Mastery Challenges | Ghost of Tsushima Legends - YouTube
The Curse of Uchitsune Mythic Tale walkthrough – Ghost of Tsushima guide - Polygon
IMPORTANT GEAR MASTERY INFO! (Assassin Bomb Pack, Cursed Gear & More!) | Ghost of Tsushima Legends - YouTube
Diablo Immortal: Cursed Gear - Legendary Items Complete Guide, New Skills and Stats - UPDATED — MisterMenPlays.com
Completing 4 curse items. Yesterday me and my friends ran chapter 1 with all curse items which we completed in this run. Got a nice bit of honour plus a curse item
The Complete Cursed Gear & Purification Ritual Guide - Ghost of Tsushima: Legends - LaggyGaming
how to purify cursed gear pieces ghost of tsushima legends|TikTok Search
PSA The Blinding Bolts cursed bow is super easy to purify with the Shogun's Fortitude charm! : r/gotlegends
Where are all the cursed chests in Kena Bridge of Spirits: collectible locations?