Radical Treatise is a Lexicon that can be wielded by Zexion in Kingdom Hearts 358/2 Days. It can be upgraded to Radical Treatise+. To wield the Radical Treatise, Zexion must have the Pandora Gear attached.
The Radical Treatise is an ornate, predominantly gold lexicon with roughly oval-shaped covers. The spine is decorated by a red diamond, as well as two white, pentagonal shapes, one above and one below the diamond. The middle of each cover is decorated by a red spike with gold edges shaped like those on the Nobody sigil. There is a black arm-like shape on either side of the bas of the spike.
When using the Radical Treatise, Zexion's ground combo finisher (without pressing after the first hit) will be a short-range claw coming out from his lexicon, dealing damage to enemies that it hits. When using the -Combo, Zexion attacks using the usual slam, then an upper slam, then an aerial slam, and then he makes the Treatise "eat" his enemy.
| Infinity | Final Weapon | Dragonreign | Aegis | Cardinal Virtue | Radical Treatise | Dichotomy | Prominence | Sanctuary | The Joker | Hallowed Lotus | Vol de Nuit | Omega Weapon|
Oblivion | Bond of Flame | Centurion | Frozen Pride | Star Seeker