Rune Essence - Increase slots maximum (HELP)

[FredZem]

Hello,
I would like a tip, where is located the slot for Runes of essence Supreme, I want to increase from 3 slot to 6 slot, but I still can not find the client and server file where I can change.
Thank you very much in advance .

attachment screenshot



Sorry my english;x

[MentaL]

[Drav3n]

I doubt it is inside of cabalmain in order to extend it.