<SMN> Primal summoning (Heaven on High)

[Jandor]

I'd be up for scrapping Trance and replacing it with Aetherpact.

Hit pact (instead of trance) and your egi grows larger and more powerful, hit Enkindle II (instead of Deathflare) and pact ends with your egi doing a big impressive attack like the magicite primals do.

Plus it feels like a more "Summoner"-y gameplay loop:
Small egi summon
Increase egi's power and size
Big summon attack
Back to small egi summon
Charge up pet again
Big summon attack again
SUMMON BAHAMUT
ENKINDLE BAHAMUT
Start over.

Would require some retcon of the 50-60 SMN story though, so not going to happen.