Talk:Arcane Velocity/@comment-16291556-20190520153506/@comment-2001:B011:EE02:1302:D5A9:6DE4:299B:5386-20190806144151

https://www.youtube.com/watch?v=OrjHS5lW_QI

Their fire rate buffs do stack, but they share one buff icon.

In your case, your buff icon shows 20% because the rank 0 one just proc.

Your fire rate buff is 80%+20%, they don't overwrite each other.