World of Slime Slime Synthesis Guide
Combine slimes to discover new species and maximise your team's potential.
Synthesis is World of Slime’s answer to breeding systems in other creature-collection games, but it goes deeper than simple combination. When you synthesise two slimes, the result depends on their species, individual stats, and a hidden affinity system that even veteran players are still mapping out. Here is a thorough breakdown.
The Synthesis Table
Every village has a synthesis table where you can attempt combinations. Select two slimes from your party, confirm the combination, and the table produces a result. The result is deterministic within the game’s combination table — the same two source slimes will always produce the same output if their individual stats and affinity states are identical. This means synthesis is not random in the traditional sense; it is a hidden recipe system.
What Carries Over
When two slimes combine, the child slime inherits a blend of both parents’ elemental types and a selection of their stat distributions. The exact inheritance follows a weighted average biased slightly toward each parent’s strongest stat. Abilities are inherited from the parents with a chance to combine into a hybrid ability — these hybrids are some of the most sought-after results in the game and are clearly marked in the Slimepedia once discovered.
Discovery Recipes
The Slimepedia includes a synthesis discovery log that starts empty. Every time you create a new combination — one you have never made before — it is recorded with the exact recipe and the resulting slime. This log is permanent across your save file, meaning your synthesis knowledge grows throughout the entire game. Veteran players treat the discovery log as a trophy system as much as a strategic tool.
Stat Breeding Strategy
If you want a slime with specific peak stats, synthesis is your primary tool. The strategy involves selectively breeding high-IV parents: capture many specimens of a species, identify the ones with the best individual stats, and use those as synthesis parents. Over multiple generations you can push a stat toward its maximum possible value. This is a long-term investment — do not expect perfect stats in the first few generations.
Affinity and Fusion Bonuses
Each slime has an elemental affinity value that affects synthesis outcomes. When two slimes of the same elemental type are combined, the result gets a fusion bonus — higher stat inheritance rates and a chance for the child to unlock a rare passive ability. This makes mono-element teams not just viable for thematic builds but genuinely powerful for synthesis-focused players.
Common Mistakes to Avoid
The biggest mistake new players make is synthesising their only copy of a rare slime before they have filled in the Slimepedia entry. Always record the original before you experiment. Another common error is ignoring the affinity system — randomly combining slimes without considering elemental matching produces suboptimal results. Plan your synthesis with the same care you would plan a build in any RPG.
Frequently Asked Questions
Quick answers to the most common questions about the game.
Can I reverse a synthesis?
No. Synthesis is permanent. Only keep slimes you are sure you want to use for breeding. Store valuable originals in the Slimepedia safe by recording them first.
Do fused slimes count as new species?
They count as a new entry in the Slimepedia if the combination has never been made before. If it is a known recipe, it is recorded under the existing entry.
What is the rarest synthesis outcome?
The rarest outcomes are hybrid abilities — combinations where both parents' abilities merge into a new passive that neither parent had. These have been confirmed by data miners but no的玩家 has publicly documented all of them yet.
Can I synthesise two of the same slime?
Yes. Same-species synthesis is legal and often produces a statistically stronger version of that species with a small chance of a hidden mutation ability.