- “Now take this sword, this Treaty-Blade. Occurian seal, mark of your worth. Cut deep the Cryst and seize your Shards. Wield Dynast King's power! Destroy Venat!”
- —Gerun, leader of the Occuria
In the past, the Occuria gave a blade known as the Sword of Kings to King Raithwall, who used it to carve the Dawn Shard, Midlight Shard, and Dusk Shard from the Sun-Cryst, and forge the Galtean Alliance. The Occuria gave the Treaty Blade to Princess Ashe, Raithwall's descendant, for a similar purpose - to cut her own shards from the Sun Cryst, and use them to destroy the Archadian Empire and bring forth a new peace. However, by this act Ashe would submit to Ivalice being controlled by an Occurian-appointed ruler, the destiny that the Archadians were trying to overturn.
Atop the Pharos at Ridorana, Ashe was given the chance to cut new shards of nethicite from the Sun-Cryst, and use them to fight the Empire. However, she realized the Dalmasca she was fighting to reclaim was one which did not abuse the nethicite's power. Ashe thus refused the Occuria's assistance and did not use the blade.
Doctor Cid arrived and produced the three shards Raithwall had cut, returning them to the Sun-Cryst and causing a violent and volatile Mist to spill from the stone. Vaan wields the Treaty Blade while Ashe wields the Sword of Kings, and the two attempt to destroy the Sun-Cryst to stop the Mist. Reddas takes the Sword of Kings from Ashe and sacrifices himself to destroy the Sun-Cryst as the party escapes.
Unlike the Sword of Kings, the Treaty Blade is never lost during the course of the game and remains in the party's inventory at all times.
The Treaty Blade is a two-handed Greatsword with an Attack power of 30 in the standard version and 67 in the International Zodiac Job System version, and boosts Evade by 30. It can't knockback opponents like other greatswords. In the standard version it is the Greatsword with the lowest attack, along with the Sword of Kings, but its combo rate is 25%. It requires no license to equip, and as a key item cannot be sold or discarded. All greatswords have 2.47s charge, and 1.2s action time, making them average what it comes to attacking speed.
Ashe wields the Treaty Blade in the Theatrhythm Final Fantasy.
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- “Symbol of a sworn treaty, and the irony of bringing about peace through destruction.”
Treaty-Blade grants +4 to Attack. It can be equipped by Knight, Mystic Knight, Cecil, Bartz, Cloud, Squall, Seifer, Steiner, and Vaan.
|Final Fantasy IV|
|Cecil Harvey: Mythgraven Blade|
|Final Fantasy V|
|Bartz Klauser: Brave Blade|
|Gilgamesh: Excalibur - Excalipoor - Zantetsuken - Masamune|
|Compilation of Final Fantasy VII|
|Cloud Strife: Buster Sword - Fusion Swords - Ultima Weapon|
|Tifa Lockhart: Premium Heart|
|Vincent Valentine: Cerberus|
|Yuffie Kisaragi: 4-Point Shuriken|
|Remnants of Sephiroth: Dual Hound - Souba - Velvet Nightmare|
|Final Fantasy VIII|
|Squall Leonhart: Lion Heart - Revolver|
|Rinoa Heartilly: Cardinal - Shooting Star|
|Laguna Loire: Machine Gun|
|Final Fantasy IX|
|Zidane Tribal: Mage Masher - Orichalcon|
|Final Fantasy X|
|Tidus: Brotherhood - Caladbolg|
|Final Fantasy X-2|
|Yuna: Tiny Bee|
|Final Fantasy XII|
|Vaan: Anastasia - Sword of Kings|
|Ashe: Treaty Blade|
|Gabranth: Chaos Blade|
|Final Fantasy XIII|
|Lightning: Blazefire Saber - Omega Weapon - Zantetsuken|
|Final Fantasy XIII-2|
|Serah Farron: Starseeker|
|Final Fantasy Unlimited|
|Kuroki Kaze: Magun|