Summons need to be increased in power if they are going to be brought back.
Kay. Type 0.
That is power.
And from the novel.
In the official novel version of Final Fantasy Type-0 The Knights of the Round appeared as an powerful Eidolon instead of Alexander in the game. They are thirteen 30-meter tall warriors in red armors. --- I have always hoped for a BERSERK Final Fantasy Game to be made realized. Official GILGAMESH of every Gamefaqs Board
Second is tied between Leviathan and Odin. I also liked Cerberus from VIII and Fenrir from VI. (Three-headed dragon looking dog and wolf summons= <3 for me.) --- The Official "Hallowed Father, the First Sire" of all FF boards