# Fusion and evolution

How monster experience works, what evolution costs, and what to do with spare materials.

<https://mahjongmonsters.games.pocosoft.jp/guide/en/fusion.html>

**Fusion** feeds material (monsters or items, 5 slots in total) plus gold into a monster to raise its level. **Evolution** replaces a maxed-out monster with the next step of the same line.

## How experience works

**The experience needed for the next level is `rarity factor × current level`**, where the factor is 10 (common), 15 (uncommon), 25 (rare), 40 (epic), 60 (legendary).

**A monster used as material gives `Lv1 value + increment × (Lv − 1)`, plus 0.5 × the experience it had earned**, multiplied by the affinity bonus.

**Each rarity step multiplies a material's worth by 5.** Deeper dungeons drop higher rarities, so a lap deeper in also yields more experience.

| Rarity | Level cap | Experience to next level |
|---|---|---|
| Common | 20 | 10 × Lv |
| Uncommon | 30 | 15 × Lv |
| Rare | 50 | 25 × Lv |
| Epic | 70 | 40 × Lv |
| Legendary | 99 | 60 × Lv |

| Item | Experience granted |
|---|---|
| Fusion Powder (S) | 100 |
| Fusion Powder (M) | 800 |
| Fusion Powder (L) | 9000 |
| Glimmer Stone | 100 |
| Spirit Pearl | 500 |
| Sacred Orb | 2000 |
| Divine Crystal | 10000 |
| Family material A | 100 |
| Family material B | 500 |

## Affinity bonus

**Feeding a monster from the same line (same family and element) gives ×2, and sharing just the family or just the element gives ×1.5.** Otherwise ×1.

Evolution replaces the monster in place, so nothing is left over. A separately obtained lower-rarity monster from the same line feeds at ×2, so do not throw those away.

## What evolution costs

The monster **must be at its level cap**. Then you pay the evolution stone, the family material and gold.

**Epic needs Family material A ×1; legendary needs Family material A ×1 + Family material B ×1.** Family materials drop in the dungeons where that family appears.

**The level carries over** — the old rarity's cap becomes the new monster's level. Experience resets to zero.

| Evolves into | Stone | Family material | Gold |
|---|---|---|---|
| Uncommon | Glimmer Stone ×1 | — | 500 |
| Rare | Spirit Pearl ×1 | — | 2000 |
| Epic | Sacred Orb ×2 | Family material A ×1 | 8000 |
| Legendary | Divine Crystal ×3 | Family material A ×1 + Family material B ×1 | 30000 |

## Spare evolution material

Evolution stones and family materials **can be used as fusion material** (a flat value, with no affinity bonus).

The stones the shop does not stock (Sacred Orb, Divine Crystal) and the family materials **can be sold**. The shop will not buy back the stones it sells, nor the fusion powders.

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This page is generated from the app's master data, so the numbers are the ones the game actually uses.