Pillar of Sky are multiple locations in Final Fantasy Legend II. The Pillar of Sky are holding the Celestial World, and if the pillars in each world become unstable, the World may be torn to pieces.
The pillars are used by the party to travel from one world to another by traversing the Celestial World, which connects to each of the game's independent worlds through the Pillar of Sky.
The party comes across Apollo at the base of the second Pillar of Sky on Final World. He greets them, telling them that he knows the party has seventy-six MAGI and he has the seventy-seventh one right in his hands which happens to be a Defense MAGI. Either he or the party will get it all. The main character tells Apollo that s/he changed his/her mind, and tells him s/he's not going to let him have them. Apollo sends his Minion to battle the party.
After the battle, Apollo sees that the party is strong, and shows them that he has captured Taro and Hana, Lynn and Ki, Flora and Leon. He ask the party what they are going to do, hand over the MAGI, or forsake their friends. The main character realizes that Apollo meant to do this from the very beginning, and hands over all the seventy-six MAGI.
Apollo ask them if they wish to live as servants of Apollo, the only god. The main character refuse and tells Apollo that he can't use those MAGI because it'll ruin the whole world. Apollo laughs it off saying that it's a rumor that the Guardians made up. He tells them that he'll become a real god with these MAGI and create his own world before leaving the area.