Aeons are pets that you can summon.they attack and they help Summoner can unlock all of the aeons even ones that aren't on the list.Everyone has to choose ONE!Meet: Valfor -Very kind and helpful. Heals you and your mp. perfect for mages.
Dark Ifrit- known as living hell. An ultimate aeon perfect for evil.
Ixion- known as the electric unicorn. also good for a mage because ixion uses spells and attacks with his horn.
shiva- known as ice queen. uses water and ice to attack when its her ultimate move its CHAOS.
Bahumat- nicknamed "chaos" or "The K" he is ultimate. he only attacks with his ultimate move which is very powerful.
There is TONS more but these are the starters. REMEMBER your only allowed to have one. If you are a Summoner you can get more by earning them.