You only need to feed it once. It’s the easiest one to get.
You need 7 greens. You can collect them all at once. Then you need to find and feed the alpaca once per day for 7 days.
Very low, I have been trying on multiple alts and still haven’t got it. The boss is not up all the time, so you’ll have to wait. Once it’s up, it will be killable for one week.
I don’t know what it is about camels and alpacas, but i just needed them both. Glad to see alpacas are also in the game now. You should probably do the feeding it 7 times one first. That’s the easiest. The voldun one tends to take a while to spawn so if you find him and feed him once then great, if not, expect to wait for a while.
And the other one is a once a month chance for a 1% mount which basically means : Not a reliable one.
You can buy it at one of the vendors on the Tortaga Refuge on Vol’dun. Other vendors too, but that one on the right area.
When this mount first showed up, people listed groups on the group finder tool, you might want to check that, it will be a great help, because the mount can spawn in several places and is hard to find.