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• I have finished the game.
• Cleared the last quest to kill The Reaper F.O.E.
• Cleared the final quest to attain Zeus.
• After the quest, it is said in the Velvet Room that I am supposed to be able to fuse Zeus.
• However, there is no option to fuse him.
• After I looked up here, https://www.gamefaqs.com/3ds/739685-persona-q-shadow-of-the-labyrinth/faqs/70858#section59. The Warrior Zeus Persona is on level 87.
• The Zeus itself is on level 91.
• I need to fuse Warrior Zeus first before fusing Zeus.

• There are some information in this forum post, https://www.gamefaqs.com/boards/739685-persona-q-shadow-of-the-labyrinth/70715832.
  • To fuse Warrior Zeus I need these.
    • Metatron.
    • Michael.
    • Satan.
  • Michael and Satan already can be summoned through compendium.
• From this link, https://www.gamefaqs.com/boards/739685-persona-q-shadow-of-the-labyrinth/70773342.
  • Metatron can be fused with these.
    • Ardha.
    • Satan.
  • Ardha is still missing.
• From this link, https://www.gamefaqs.com/boards/739685-persona-q-shadow-of-the-labyrinth/70836923.
  • Ardha can be fused with these.
    • Shiva
    • Parvati.
  • Shiva can be fused with these.
    • Barong.
    • Rangda.
  • Shiva is at level 73.
• So, aside from level requirements. The Personas requirements for Warrior Zeus are these.
  • 2 Satans.
  • Ardha.
  • Barong.
  • Metatron.
  • Michael.
  • Parvati.
  • Rangda.
  • Shiva.
  • Shiva.
• Additionally, Seth is necessary to fuse Zeus.