Weapon Stone
Weapon Stones are rare materials needed for advanced crafting. Players typically get them by reducing unneeded and weapons.
Usage
| Use | Amount |
|---|---|
| Characters | |
| Transcend an Eternal to Stage 4 | 2000 |
| Weapons | |
| Uncap Rise of the Beasts Weapons to 4★ | 20 |
| Uncap Showdown SSR weapons to 4★ | 60 |
| Uncap Cosmos Weapons to 4★ | 200 |
| Uncap Omega weapons to 4★ | 200 |
| Uncap Omega weapons to 5★ | 200 |
| Uncap Draconic Weapons to 5★ | 200 |
| Uncap Ultima Weapons to 5★ | 2000 |
| Uncap Premium Draw Weapons to 4★ | 200 |
| Uncap Premium Gala Weapons to 4★ | 300 |
| Uncap Silver Relics to 4★ | 300 |
| Uncap Trade Moon Weapons to 4★ | 300 |
| Transcend Dark Opus Weapons to Stage 2 | 1200 |
| Transcend Dark Opus Weapons to Stage 4 | |
| Weapon Series Shop | |
| Rebuild Replica-based Class Champion Weapons | 256 (50First time only) |
| Change a Replica-based CCW's element | 512 (150First time only) |
| Forge a Rusted-based Class Champion Weapon | 280 |
| Uncap Seraphic Weapons to 4★ | 255 |
| Create an Ultima Weapon | 500 |
| Treasure Trade Shop | |
| Purchase Supreme Weapon Masteries | 2000 |
| Purchase Dark Opus Weapons | 255 |
| Purchase Draconic Weapons | 500 |
Obtain
- Reduce SR or SSR weapons:
- Farmable SR: 1
- Farmable SSR: 20
- Cosmos Weapons: 1
- Premium Draw SR: 15
- Premium Draw SSR: 200
- Prestige Pendant shop (100 pendants for 20, limit 10 per month)
- SkyLeap Point Shop (20 for 500 points, limit 5 per month)
- Cerulean Stone shop (3 stones for 1, unlimited)
- Xeno Showdown shops (100 stones; the types available match to the Showdown's Xeno Weapons)
Farming Weapon Stones
Weapon stones are primarily obtained by reducing weapons.
The most reliable way to farm weapon stones is by quickly defeating low-HP (5 arrow gauge) enemies in Replicard Sandbox which drop the appropriate Sephira Weapons, and reducing them. The chest which drops weapons is not guaranteed, so it is recommended to equip Avarice's Guidebook in addition to any other convenient drop rate boosts in order to maximize the chance of a weapon drop.
If Replicard Sandbox has not been unlocked yet, Omega Raids are a (considerably less effective) alternative for obtaining Weapon Stones. Maximizing the number of chests you earn per raid—using Drop Rate Boosts to maximize flip chest chances, hosting your own raids for the host red chest, and aiming for MVP or Vice-MVP spot(s) for the MVP red chest—is recommended. Certain raids (mostly Impossible raids) also have blue chests, which are only awarded for getting high honors and are not affected by Drop Rate Boosts.
Premium Draw weapons reduce for a lot more stones than farmable weapons do. However, the scarcity and difficulty in obtaining a specific Premium SSR weapon should be recognized, players seeking to build Optimus Grids (or otherwise) may regret reducing a useful Premium weapon for stones which could have been farmed relatively quickly. Research individual Premium SSR weapons before reducing them; some are used as grid weapons in Normal Teams, or have other useful abilities that make them valuable for all players. Additionally, seemingly worthless weapons may receive uncaps or rebalances in the future which make them worth keeping, so it is generally recommended to avoid reducing Premium SSR weapons regardless.
Premium SR weapons can all be reduced; they offer far less stones than their SSR counterparts, but they are easier to pull, are not used in any grids, and offer much more stones than their farmable counterparts. Some players uncap Premium SR weapons with 
Steel Bricks to maximize the amount of stones they get from them.
The Casino weapons (
Acinaces, 
Laevateinn, and 
Jewel Modele) are treated as Premium Draw weapons, and can be bought up to 4 times each.
Every 7 Elemental Skill levels, the amount of bonus weapon stones gained by reducing Premium Draw SSR weapons increases, up to a +14 bonus at Level 98. At Level 76, bonus weapon stones gained by reducing Farmable SSR weapons is raised to a +2 bonus.