Class mount could be a golem-like maount made out of the earth itself, then it will be summoned directily from the ground. for concepts a came with:
1. stone ram or bull.
2. wooden tree-like stag or horse.
3. magma wolf or lion (I prefer this as a companion more than a mount) .
4. lightning spirit lizard or bear.
with these i think it can reflect what most of people want ith this post.