Fuse guide in Seven Knights Re:Birth. Includes Hero Fusion feature, fuse Hero probabilities, Guaranteed Fusion rates, character fuse materials, crafting differences, tips and more.
Table of Contents
Fusion and Crafting Differences
Fusion is Chance-based Crafting
Fusion is a system where you consume two +5 Heroes of the same rank to randomly obtain one Hero of the same rank as the materials or one rank higher. It becomes available after clearing Adventure Stage 2-10.
 Tips! | For Pet Fusion, there is no need to Power Up to +5; you can fuse pets of the same Rank as they are. |
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Requires Fewer Materials Than Crafting
There is a similar feature called Crafting, but the main characteristic of Fusion is that it requires fewer materials because the Hero you receive is random. Also, unlike Crafting, Fusion does not have a usage limit, such as once per week.
Fusion and Crafting Comparison
| Fusion | Crafting | |
| Power Up Level | +5 | 0～ |
| Materials | 2 of the same Rank | 3★ Units ×4 6★ Legendary units ×3 6★ Rare unit ×10, etc. |
| Source | Randomly from the same or one Rank higher than the materials | Selected Hero (Pet) or Summon Card |
| Usage Limit | None | Yes |
How to Use Fusion
1. Open the Fuse Menu
Go to the Fusion screen from Home > Power Up > Power Up Heroes > Fusion. For Pet Fusion, select Home > Grow Pets > Fusion.
2. Select Fuse Materials
Select two Heroes of the same Rank that have been Powered Up to +5 to use for Fusion. Once selected, you can perform the Fusion by consuming Gold.
| Tips! | Increasing your Adventurer Skill will increase the available slot for Fusion, allowing you to fuse multiple units at once. This only reduces the number of times you have to perform Fusion and does not affect the outcome. |
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Fusion Rate List
Fused Hero Type Rate List
| 5★ Fuse | 4★ Fuse | 3★ Fuse | 2★ Fuse | 1★ Fuse | |
| Legendary (Seven Knights of Old) | 0.08% | 0% | 0% | 0% | 0% |
| Legendary (Special Hero with a red mark) | 0.72% | 0.6% | 0.4% | ||
| Legendary (4★ to 6★) | 1.2% | 0.9% | 0.6% | ||
| Rare (4★ to 6★) | 98% | 14% | 14% | ||
| Uncommon (3★ to 4★) | 0% | 84.5% | 85% | 40% | |
| Common (1★ to 3★) | 0% | 0% | 60% | 100% |
The approximate Fusion rates for each Hero type are as shown above. The Fusion rates for Legendary Heroes differ between special Heroes with a red mark, the Seven Knights of Old, and others. Note that the Seven Knights of Old are the ones with a purple mark in the upper right corner of their icon.
5-star Fusion Has a 200-Fuse Pity System
There is a guaranteed fusion probability where if you perform 5-star Fusion 200 times without getting a Seven Knights of Old, you are guaranteed to get a Seven Knights of Old Hero on the next Fusion. It's a long road, but don't give up and keep trying even if you have bad luck.
Fused Pet Rank Rate List
| Guaranteed 3★ | 3★ Fusion | 2★ Fusion | 1★ Fusion | |
| 4★ Legendary | 1% | 0.15% | 0% | 0% |
| 4★ Rare | 99% | 14.85% | ||
| 3★ | 0% | 85% | 45% | |
| 2★ | 0% | 55% | 90% | |
| 1★ | 0% | 10% |
The approximate Fusion rates for each pet Rank are as shown above. For pets, you can only perform Fusion up to 3-star. There is a Guaranteed Fusion mechanic where if you perform 3-star Fusion 10 times without getting a 4-star, you are guaranteed to get a 4-star on the next Fusion.
Related Seven Knights Re: BIRTH Articles
▶Back to Top PageRanking Articles
| Ranking Articles | ||
|---|---|---|
  Best Hero Tier List |  Reroll Tier List |  Best Pet Tier List |
How To Reroll Fast?
Leveling & Ruby Farming Guide
Daily Things to Do
Latest News & Updates
Best Heroes and Teams
Best Full Moon Summon Heroes
Moon Box Guide & How To Farm
Advent Expedition Guide
Best Low Rarity Heroes
Best Premium Shop Purchases
Early Game Guide
Player Rank (Adventurer Skill) Guide
Enhance Guide
Equipment Powerup
Pet Guide
Formation Guide
Guild Guide
Party Guide
Debuff Types Guide
Gacha Animation Effects
Accessory Guide
Hero Stats Guide
Arena Guide
Coupon Codes
Infinite Tower Guide
Castle Rush Guide
Shop Items to Buy
Fodder Hero Guide
Destroyer Gaze Guide
Ox King Guide
Iron Devourer
Tower of Trials Guide
7K Chess Guide
Equipment Preset Guide
Battle Statistics Guide
Recommended Relay Purchases Guide
Weakness Hit Guide & What is It?
Error Guide and How to Fix
Burn / Dragonflame Guide
Paralysis Guide
Bleed Guide
Freeze Guide
Stun Guide
Petrify Guide
Shock Guide
Sleep Guide
