I have tried use this item to add more option to my weap but it seem like something wrong. My weap has 4 options but i got message below:
Uncle Google won`t hurt You. The price of add stat is different at each step: 1->2 cost 10 000 000 Gold and 1 Rune 2->3 cost 20 000 000 Gold and 2 Runes 3->4 cost 40 000 000 Gold and 3 Runes 4->5 cost 80 000 000 Gold and 4 Runes 5->6 cost 120 000 000 Gold and 5 Runes Source: http://forums.playredfox.com/index.php?threads/add-stats-to-weapons-weapon-trad.120/#post-2008
icy purple runs should drop them still. Apparently they drop on green/red according to the announcement about revamp but I've never seen any
It's rare even with item mall purple pass and 3x event. I only got 1 add rune out of 8 runs. All item mall passes.
once you use the option add runes to add a new option you can then use the option switch runes to change the option if you don't like it