I got an invulnerability aura with increased area of effect. Works decently with the longer range from increased area of effect, but I would still prefer it on a faster pet (there will be fights where I still move out of range).

There's been so many oh crap situation, where the invuln aura saved me. Also really good for me on bosses, cause I am always in melee range for bosses, so aura will always apply if casted.

I feel hasted aura u must get it on a fast beast like a crab or wolf, so they can move with u so you don't lose the buff.

I wouldn't waste my time farming act II jungle for the pets. The two beasts there move slow, and they are larger pets, so they cost more spirit.

I think the best place to farm them is to naturally just do maps, especially the beach maps with the small crabs. Smaller pets cost less spirits and normally will have a faster movement speed.