Hi; First an idea that probably already exist : spell cards given by a pet of the school of the pet.Hybrid will be more interesting by this way cuz they will give us access to other school spells without needed a master amulet to cast them at right cost.
When a pet reach ultra well done you can put ultra jewels...Yay... and thats all. Why not a quest that give a powerful talent based on the school of the pet and the pet himself. I got this idea after getting the mortal toil onyx;
- aura stay one more turn - pet become a companion for 2 round after a moon spell is cast (exemple tinym whiteheart +5% dmg/+2% def) - enchant receive a flat +10 - shadow pip
That for the stats + maycast.
Exemple: Lil siren:+6% damage and maycast sea-song after a hit: +10% trap on all then 200 dmg on target Artic siren: +4% resist and maycast glacial echo after a hit: -10% shield on all then 150 dmg on target
More than just making the ultra lvl very interesting to reach that give to the game more diversity for the pet choice and the hybrid could give interesting variations for the spell casted by the original pet (i let you imagine a spell and his variation for leviathans pets)
For the quest that could be a deckathalon tower li'e but stat are determined by the pet we have and deck precharged with the spell given by the pet if he get one added. Don't know if thats possible to do but if that can give few idea for a future updates
Feel free to add some idea if you want or to express what do you want to see on your favorite pet. (No way for the enchanted armament maycast +100% blade and -100%tower shield after you cast a spell of course)