# Eternals: Holy Fusion
Holy Fusion is a core mechanic in the game that allows you to customize and upgrade your **Fusion NFTs**. The primary goals of Fusing are:
* **To change the Themes** of your Fusion NFT's Parts (Head, Body, Wings, Expression)
* **To increase the Rarity** of its Parts.
* **To gain EXP** and level up your Fusion NFT, unlocking new features.
This guide will walk you through the entire process.
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### Step 1: Preparation for Fusion
Before you can begin, you must gather the necessary Fusion Materials.
#### Required Materials
You will need the following items to initiate a Fusion:
* **Etergene**
* Each Etergene belongs to a specific **Collection/Theme**.
* You can only use a **limited number of the same theme** in one Fusion, so you can’t fully force the outcome.
* **Etercore**
* A **universal** Fusion Material.
* Used together with Etergene to influence theme results.
Kindly note that all Fusion Materials used will be consumed when you fuse.
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#### Leveling Up
Your Fusion NFT needs to gain enough Experience (EXP) before it can level up, and the amount of EXP required will increase with each level.
For example:
* **Level 1:** Requires 60 EXP
* **Level 5:** Requires 120 EXP
* **Level 10:** Requires 600 EXP
> Note: As your Fusion NFT increases in level, more materials will be required to initiate Fusion.
Additionally, as you level up, higher–rarity parts will start to appear, and your chances of getting them will also increase.
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#### Feature: Locked Parts
From Level 5, you can use the Lock item to Lock Parts so they are not changed during fusion. Any Locked Part will keep its current theme. Locks comes as a bonus gift when purchasing specific Packs in the shop.
#### Number of Locking Slots by Level
The number of Slots you can Lock will increase as you level up.
* **Level 1–4:** No lock slots.
* **Level 5–9:** You can lock **1 Part**.
* **Level 10+:** You can lock **2 Parts**.
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### Step 2: Performing the Fusion
#### Starting the Fusion
* Choose which **Fusion Materials** (Etergene + Etercore) to use.
* Choose which Parts (if any) you want to **lock**.
* When everything is ready, the **FUSE** button becomes available, press it to start.
#### How Fusion Selects Parts
When you initiate the Fusion, the system determines which of your NFT's Parts will be transformed. This follows a specific set of rules:
1. **Locked Parts are protected:** As part of the **Locked Part** feature, any Part you have applied a Lock will be skipped by the Fusion process and will not be changed.
2. **Random Selection:** The system will then **randomly select** from all remaining, non-locked Parts to undergo the Fusion process.
#### Random Theme Generation
For the Parts that were selected for Fusion, the system will randomly generate a new theme. This randomization is based on two main factors:
1. **Theme Input:** During Fusion, each Part that is selected will receive a new theme based on the Etergene you used. The system only randomizes themes within the same Collections as the Etergene you put in.
For example: If you only use Etergene from Collection A and Collection B, the new theme will be chosen from themes in A and B only.
1. **Rarity Limit:** The new theme will also always stay within the Part’s **current Rarity tier** and will not jump to a higher Rarity through normal Fusion.
For example: If a Part is **Rare**, it will only roll **Rare themes** and cannot become **Epic** or **Legendary** just by fusing.
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### Step 3: Receiving the Fusion Results
After each Fusion, you can see:
* Which **Parts changed** and what their **new themes** are.
* How much **EXP** you gained.
* Your Holy Cat’s **current level** and **progress** to the next level.
* Any **Rarity changes** (if they happened).
* Updated **Rarity Points**.
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### Obtaining Fusion Materials
There are 4 different methods when it comes to obtaining Etergene and Etercore:
1. **Daily Missions**
Completing daily missions is the most reliable way to gain Fusion Materials. These missions will reset every 24 hours. Afterwards, new missions will be introduced and more Fusion Materials you can obtain.
2. **Achievements**
Achievement is also another source of Fusion Materials. However, unlike Daily Missions, once you have claimed them, it will not be able to replenish.
3. **Daily Gifts**
One of the simplest ways to gather Fusion Materials is through the Daily Check-in. You’ll receive rewards each day you log in, and completing all 7 days will grant you additional Fusion Materials.
4. **The Shop**
You can purchase Fusion Materials directly from the shop using **$ETER.**
### Viction Retrodrop Season 4
**Eternals: Holy Fusion** is exclusively designed to help you qualify for the **Eternals Campaign Badge** and secure a higher ranking and allocation from the **1,250,000 $VIC** Viction Retrodrop Season 4 total reward.
**How to Qualify:**
Complete in-game missions and on-chain activities to maximize your eligibility. Key qualifying metrics include:
* **Total Active Time** - Play and stay engaged in the game
* **Number of Play Sessions** - Fuse, level up, and return regularly
* **New Registered Wallets** - Create or import your wallet
* **On-chain Transactions** - Mint NFTs, make payments, and interact on-chain
Learn more at the Foundation site 👉:
**Why It Matters:**
The Eternals Campaign Badge equals a **Flame Tier Foundation Badge**, guaranteeing your spot in the Viction Retrodrop Season 4 distribution.
**Fuse Now and Secure Your Spot!** There are only **3000** Campaign Badges available.
