Blue Sky Crystal
A crystal that brilliantly shines in the light.
Blue Sky Crystal is a rare material that can only be gathered in very limited quantities over time. They are mainly obtained by completing all 3 daily co-op missions.
Usage
| Use | Amount |
|---|---|
| Characters | |
| Uncap SR Characters to 5★ | 2 |
| Uncap SSR Characters to 5★ | 3 |
| Class Champion Weapons | |
| Reforge a Replica-based CCW | 5 |
| Rebuild a Replica-based CCW | 5 |
| Change a Replica-based CCW's element | 15 |
| Uncap a Replica-based CCW to 5★ | 20 |
| Forge a Rusted-based CCW | 60 |
| Revenant Weapons | |
| First upgrade | 3 |
| Second upgrade | 5 |
| Third upgrade | 7 |
| Fourth upgrade | 10 |
| Fifth upgrade | 15 |
| Sixth upgrade | 30 |
| Other Weapons | |
| Uncap Trade Moon Weapons to 4★ | 5 |
Uncap  | 5 |
| Upgrade Bahamut Weapons to Nova form | 7 |
| Uncap Hollowsky Weapons to 4★ | 30 |
| Uncap Cosmos Weapons to 4★ | 50 |
| Summons | |
| Uncap Rotating Showdown summons to 4★ | 5 |
| Uncap Omega summons to 5★ | 10 |
Obtain
- Complete all 3 Co-op daily missions (1 per day)
- Story events, redux events, and side stories:
- Complete a Challenge Battle for the first time
- Story event daily mission (last day only)
- Complete a solo Nightmare battle for the first time
- Can appear rarely as a Treasure item in event draw boxes
- Drop from Grand Order, Huanglong and Qilin
- Rare drop from 18-man HL Raids
- Rare drop from Unite and Fight Nightmare bosses
- Rare drop from Arcarum chests
- Rare drop from Rise of the Beasts Proud battles
- Cerulean Stone shop (10 stones)
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