On hit, Normal or Charged Attacks increase ATK by 6/7/8/9/10% for 6s. Max 4 stacks. Can only occur once every 0.5s.
In Game Description
A reliable steel sword. The legendary Skyrider once tried to ride it as a flying sword… for the second time.
How to Get Skyrider Greatsword?
Obtainable from chest. There’s also one greatsword stuck in a stone on top of Domain of Guyun in Guyun Stone Forest
Weapon Upgrade Materials
Here’s all material used to upgrade Skyrider Greatsword: