It's probably strange but I'm going to use pokemon as an example to explain my ideas for the future to come. Right now Ifrit egi is in every way a Charmander, a pre-evolved pokemon. Titan is close to a Geodude, and Garuda is similar to a Pidgey, even in their abilities they can be compared, and I'm guessing when they are added Leviathan will be a Squirtle and Ramuh a Pikachu. As the level cap grows, I'm hoping our summoners abilities will grow too, lore-wise I mean, to take on the giant dragons/other big baddies coming our way. To me, it would be pretty silly to take on one of those legendary Pokemon with a CHARMANDER, so as the summoners become more powerful, they would become able to extract larger amounts of essence from the primals, and essentially, we could have evolved forms of the egis we have now, with stronger abilities and forms. No not HUGE primals, still referencing Pokemon here, the final evolved form of Charmander is still only about the height of a human.