Vengeance bug

Why can't vengeance be learnt on earth mobs ? It's not stated in the description at all and I bought it just to know that I can't use it on earth mobs, pls either refund the blessings or fix this pls

I already brought this up a week ago. We were already compensated 500 essences for buying the skill book.

I bought punishment and gave it to my rhor and I wasn't compensated anything...
(Punishment does absolutely nothing for rhor)