I really needed that info on how to refine my weapon.
I lost 2 lvl 20 sords a shield prbably 6 lvl15 swords trying to refine them.
Then I saw a message once I was refining I got the title unlucky enchanter.
So this will say that there is experience and training in refining to.
I bought a few lvl 1 swords and used a LOT of elrues and yes there is a skill to train . In one session I got my lvl15 sword up to +6 and and the failures and breaks are getting less.
So guys dont start refining your expencive weapons just to get them shiny.
This is my experience.
I just love the game