Zodiac Weapons are the level 50 Relic Weapons for A Realm Reborn. You will need to complete the quest "The Weaponsmith of Legend" to begin.
You will need to complete "A Relic Reborn (Artemis Bow)" for example for the weapon of Bard, it will therefore always be necessary to start with a quest "A Relic Reborn (...)".
You will have to craft (NQ or HQ) the requested weapon and set it with two materia indicated in the quest.
1x Radz-at-Han Quenching Oil (15x Allagan Tomestone of Poetics)
Radz-at-Han Quenching Oil : Can be obtained with Allagan Tomestone of Poetics from Auriana in Mor Dhona (22.7, 6.7). (See lodestone link for full list)
Go to the Furnace in the North Shroud (30.2, 19.9) and upgrade the weapon in Zenith using 3 Lymph of Thavnair.
3x Lymph of Thavnair (60x Allagan Tomestone of Poetics)
Lymph of Thavnair : Can be obtained with Allagan Tomestone of Poetics from Auriana in Mor Dhona (22.7, 6.7). (See lodestone link for full list)
The first time you will have to complete the quest "Up in Arms".
You have to upgrade the weapon to Jalzahn in North Shroud (29.6, 19.4) with 12 Atma obtained on FATES in Eorzea, they have a 25% chance of falling on a FATES and you must be equipped with a Zenith weapon.
The first time you will have to complete the quest "Trials of the Braves".
You will need to buy 9 "Trials of the Braves" Book Collection from G'jusana in Mor Dhona (22.8, 7.3). (can only be done one at a time)
Each book can be purchased for 100 Allagan Tomestone of Poetics.
For each book, you will have to kill specific monsters, complete dungeons (Unsynch), Levequests and Fates while equipped with your Atma weapon. (See information on the Fates)
If your Levequests does not appear in the list, you can complete one to display the one you need.
Once the 9 books are finished return to Jalzahn in North Shroud (29.6, 19.4).
The first time you will have to complete the quest "Celestial Radiance".
Superior Enchanted Ink : Can be obtained with Allagan Tomestone of Poetics from Auriana in Mor Dhona (22.7, 6.7). (See lodestone link for full list)
You must then exchange the 3 Superior Enchanted Ink from Hubairtin in Central Thanalan (23.6, 13.8) to get a Sphere Scroll.
The first time you will have to complete the quest "Star Light, Star Bright".
Alexandrite : can be obtained on the Fates of Eorzea by being equipped with an Animus weapon. Can be obtained with Mysterious Map. You can also purchase them for 50 Allied Seal to your Grand Company.
Mysterious Map : 1 Mysterious Map which allows you to obtain 5 Alexandrite, the Map is obtained from Auriana in Mor Dhona (22.7, 6.7) against 75 Allagan Tomestone of Poetics or using the quest "Morbid Motivation" from Brangwine in Mor Dhona (22.3, 7.1), you will then need to complete the Duty Dungeon.
The first time you will have to complete the quest "One Man's Trash".
Once the materia has been transferred to the Sphere Scroll is complete, bring it back to Jalzahn to upgrade your weapon.
The first time you will have to complete the quest "Mmmmmm, Soulglazed Relics".
You must perform an soulglaze with Jalzahn in the North Shroud (29.6, 19.6). Then you will have to farm 2000 lights by completing dungeons, trials, Fates or even treasure maps.
The dungeon bonus window is the same as the Mahatma window. It changes every 2 hours.
One of the fastest dungeons to farm lights is : The Thousand Maws of Toto-Rak (Equipped weapon - Unsynch)
Once the weapon is maxed out, return to talk to Jalzahn.
The first time you will have to complete the quest "Wherefore Art Thou, Zodiac".
Book of Skylight : Obtained with the repeatable quest "A Ponze of Flesh" from Papana in Mor Dhona (22.5, 7.5).
Zodium : Obtained with the repeatable quest "Labor of Love" from Guiding Star in Mor Dhona (22.3, 7.1).
Flawless Alexandrite : Obtained with the repeatable quest "A Treasured Mother" from Brangwine in Mor Dhona (22.3, 7.1).
Zodiac Scroll : Obtained with the repeatable quest "Method in His Malice" from Adkin in Central Thanalan (23.5, 14.1).
The first time you will have to complete the quest "His Dark Materia".
Once the 4 main items have been obtained, return to Jalzahn.
Bombard Core : Can be obtained with Company Seals from your Grand Company.
Sacred Spring Water : Can be obtained with Allagan Tomestone of Poetics from Auriana in Mor Dhona (22.7, 6.7).
Bronze Lake Crystal : Can be obtained with Gils from Junkmonger in Upper La Noscea (26.1, 26.4).
Allagan Resin : Can be obtained with Gils from Merchant & Mender in Southern Thanalan (15.9, 29.0).
Furite Sand : Can be obtained with Gils from Merchant & Mender in Coerthas Central Highlands (13.2, 15.9).
Brass Kettle : Can be obtained with Gils from Tool Supplier & Mender in North Shroud (29.9, 18.9).
Merchant & Mender in Western Thanalan (15.1, 29.3) : Seller of items to be desynthesizing
Perfect Firewood : Aged Spear Shaft desynthesizing : Aged Spear
Perfect Pestle : Aged Pestle Pieces desynthesizing : Aged Pestle
Perfect Mortar : Aged Mortar Pieces desynthesizing : Aged Mortar
Furnace Ring : Aged Eye of Fire desynthesizing : Aged Ring
Perfect Vellum : Aged Vellum desynthesizing : Aged Grimoire
Perfect Cloth : Stained Cloth desynthesizing : Aged Robe
Perfect Pounce : Dried Ether desynthesizing : Aged Phial
Tailor-made Eel Pie : Vintage Cooking Sherry desynthesizing : Aged Decanter
For all dungeons : Unsynch - Not equipped weapon - Any job - The reward : Can only be obtained when the quest objective requires it.
The first time you will have to complete the quest "Rise and Shine" and "The Vital Title".
You will need to go to Remon in Western La Noscea (34.3, 31.7), and ask him to attach a Mahatma to your weapon in exchange for 50 Allagan Tomestone of Poetics. It will be necessary to repeat the operation 12 times.
You need 40 points for each Mahatma.
The dungeon bonus window is the same as the lights window. It changes every 2 hours.
One of the fastest dungeons to farm Mahatma is : Aurum Vale (Equipped weapon - Unsynch)
Once the 12 Mahatmas have been completed, return talk to Jalzahn.