Black Crystal Fusion
Black Crystal Fusion is a system introduced in Season 6 - Act 01  that allows players to upgrade their Fiend War Supertemporal Armor & Prey-Isys Raid Black Sky Accessories/Special Equipment into Level 100 Equipment. This system can be accessed through NPC Administrative Officer Dorothy in Chest Town.
- Talk to NPC Dorothy, then select the Upgrade Equipment option as this requires the following materials:
- These upgrades are final and cannot be reversed once they're done, so make your decision carefully.
- If you plan on upgrading an entire set (i.e. Normalizing Synchro, Elementalist's Accessory) or individual set pieces (Mother Nature), more Black Crystals will be needed to meet those requirements.
- The Equipment's grade may likely be different depending on the option change slightly, but this doesn't apply towards the highest grade that's 100%.
- There are some events in-game can give out a Level 100 Recipe that reduces the Black Crystal cost down to 950.
- Black Crystal Fusion Equipment cannot be obtained outside of upgrading from Dorothy.
- Reinforcement/Amplification/Enchantment levels can be transferred over, but they will require more Engraving Stones to keep their values from decreasing.
- Reinforcement bonuses cannot be transferred.
- Retextured Armor will also be brought over if choosing to upgrade Super Tayberrs into Mother Nature's Breath Set.
- Fiend War - Any Supertemporal Tayberrs Armor ----> Mother Nature's Breath Set:
- Prey-Isys Raid - Black Sky's Power: