[Eru]

"teach discodance"

:3

But seriously, I tried and couldn't get it to work either. Shade will have to look at the script to see if there's a typo or something. It's really really fast to raise without the vendor though. Find a place with a lot of mobs of the same type, then do:

UseSkill: Discordance
TargetByType: Whatever Mobile

Since you can't use the skill on something that's already in discord, having lots of stuff around will make you GM it faster. I did it in a place with 8 of the same type of monster, so it was effectively 8x as fast to GM.