Eldritch Esoterica

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Eldritch Esoterica (陰陽の大全集, In'yō no Taizenshū^?, lit. "Yin Yang Collection") is one of Zexion's weapons in Kingdom Hearts 358/2 Days. It can be upgraded to Eldritch Esoterica+.

It allows Zexion to perform extremely well in midair, and also highly increases his Strength. Eldritch Esoterica's combo finisher involves Zexion transforming the Esoterica's shape into that of a bird and making it fly, making the enemy, whether airborne or in the ground, take massive damage.

Zexion's Weapons

Black Primer | White Tome | Illicit Research | Buried Secrets | Arcane Compendium | Dissenter's Notes | Nefarious Codex | Mystic Album | Cursed Manual | Taboo Text | Eldritch Esoterica | Freakish Bestiary Madman's Vita | Untitled Writings | Abandoned Dogma | Atlas of Omens | Revolting Scrapbook | Lost Heterodoxy | Otherworldly Tales | Indescribable Lore | Radical Treatise Book of Retribution | Midnight Snack | Dear Diary

Ominous Gear
Invincible | Sunrise | Shiden | Iceberg | Firefly | Yin Yang Collection | Gibbous | Volcanics | Serenade | The Hanged Man | Docile Vallota | Soleil Couchant | Fate Rebellion Soul Eater | Mage's Staff | Knight's Shield | Kingdom Key D | Kingdom Key