Explanations about the absence of summons in the first two games have been given in recent games (besides the idea for summons having come after the first two games were released). According to Dissidia 012 Final Fantasy the world of Final Fantasy at one time had summons, but depending on the timeline Garland or Chaos trapped them in the Interdimensional Rift. In the 20th Anniversary edition of Final Fantasy II, Deumion can summon Holy Beasts, one of which the party fights as a Superboss.