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.
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.
 Tip! | 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.
 Tip! | 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-star Fusion | 4-star Fusion | 3-star Fusion | 2-star Fusion | 1-star Fusion | |
| 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-star to 6-star) | 1.2% | 0.9% | 0.6% | ||
| Rare (4-star to 6-star) | 98% | 14% | 14% | ||
| Uncommon (3-star to 4-star) | 0% | 84.5% | 85% | 40% | |
| Common (1-star to 3-star) | 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-star | 3-star Fusion | 2-star Fusion | 1-star Fusion | |
| 4-star Legendary | 1% | 0.15% | 0% | 0% |
| 4-star Rare | 99% | 14.85% | ||
| 3-star | 0% | 85% | 45% | |
| 2-star | 0% | 55% | 90% | |
| 1-star | 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 |
Recommended Articles
| Articles To Check | ||
|---|---|---|
 How To Reroll Fast? |  Leveling & Ruby Farming Guide |  Daily Things to Do |
| For Early Game | ||
 Early Game Guide |  Player Rank (Adventurer Skill) Guide |  Power Up Guide |
 Equipment Powerup |  Pet Guide |  Formation Guide |
 Guild Guide |  Party Guide |  Debuff Types Guide |
| Lists | ||
| All Characters | Voice Actor List | Statuses and Effects |
Hero Per Specialty
| By Grade | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Legendary | Rare | Uncommon | Common | ||||||||||||||||
| By Max Star Rank | |||||||||||||||||||
| 6★ | 5★ | 4★ | 3★ | ||||||||||||||||
| Per Type | |||||||||||||||||||
| Attack | Magic | Defense | Support | Universal | |||||||||||||||
| By Attack-Type | |||||||||||||||||||
| Physical | Magic | ||||||||||||||||||
Legendary Characters
| Seven Knights | |||
|---|---|---|---|
| Rudy | Rachel | Eileene | Spike |
| Jave | Kris | Dellons | Vanessa |
| Seven Knights of the Old | |||
| Fai | Rosie | Juri | Secret |
| Secret | Secret | Secret | |
| Apprentice Priest | |||
| Mercure | Colt | Platin | Secret |
| Secret | |||
| Four Lords | |||
| Ace | Rin | Secret | Secret |
| Four Lords of Old | |||
| Teo | Yeonhee | Karma | Secret |
| Night Crow | |||
| Taka | Orly | Secret | Secret |
| Secret | |||
| Hidden Masters | |||
| Klahan | Secret | Miho | Secret |
| ???? | |||
| Silvesta | |||
| Adventurer | |||
| Velika | |||
| Terra | |||
| Rook | Chancellor | Alice | Aragon |
| Biscuit | |||
| Holy Cross Crusaders | |||
| Ruri | Nia | Espada | Shane |
| Sieg | |||
| Shadow Clan | |||
| Ballista | |||
| Purgatory | |||
| Knox | |||
| Moonlit Isle | |||
| Lina | Daisy | ||
| Eastern Aisha | |||
| Yu Shin | Bi Dam | ||
| Sanctuary of Darkness | |||
| Pascal | |||
