what is the use of rune orb?

[Fr0stin]

i got a rune orb and placed it on my sword(it has multiple enchants) but like id didnt do anything like what is the use of the rune orb

 

[ArryIshi]

Usually, I don't like to answer this, because most of the response to the answer was "Hah?".

Short answer : (Stick to this if you can't comprehend)
It's a garbage

Long answer :
It's used to exceed custom enchant limit, well it was. Why? Because there's no anymore limitation of custom enchant.