👬Synthesis

🛑 Information on this page may differ from the current in-game data.

ENG

◾ Hero Synthesis

Through Hero NFT Synthesis, you can grow your Hero into one with higher base stats.

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◾ Why use Synthesis?

All Hero NFTs in EXTOCIUM have base stats. Base stats affect the following content.

• Mining efficiency

• Combat efficiency

• Succession requirements

When a Hero is summoned, its base stats are determined randomly based on probability. Even Heroes with lower base stats can be upgraded step by step through Synthesis.

By using Hero NFTs with the same base stats as materials, you can increase the base stat by 1 level.

This page explains how Hero Synthesis works and the rules you need to know.

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◾ Go to Synthesis

Hero Synthesis can be accessed at the following location:

• Rottenhill > Magic Shop > Ashurbanipal Library

Among the four NPCs in the Ashurbanipal Library, talk to Chavakiah.

After the conversation, tap the [Synthesis] button to move to the Hero Synthesis screen.

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◾ How to Synthesize

The Synthesis screen uses two slots to proceed.

① Select the Target Hero

Select the Hero NFT to be used as the main Hero in Slot 1. The main Hero’s base stat will increase after synthesis.

② Select the Material Hero

Select the Hero NFT to be used as material in Slot 2. The material Hero will be consumed.

Please choose the main Hero and material carefully when synthesizing.

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Synthesis Process

• Tap Slot 1 to view a list of Heroes eligible for synthesis. Tap the [Select] button to choose the main Hero.

• Tap Slot 2 to view a list of Heroes that can be used as materials. Heroes that do not meet the requirements or are currently equipped will not appear in the list.

• Once all required Gold is prepared, tap the [Synthesize] button to proceed.

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Synthesis Result Example

As a result of synthesis, Hero #2489’s base stat increased from 15 → 16.

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◾ Synthesis Rules and Materials

You can check the required steps and materials for Hero Synthesis in the table below. A Hero’s base stat can be upgraded up to a maximum of 21.

Grade	Required Materials	Additional Materials
15 ▶️16	Base Stat 15 - 1 Hero NFT	8.88 million gold
16▶️17	Base Stat 16 - 1 Hero NFT	8.88 million gold
17▶️18	Base Stat 17 - 1 Hero NFT	8.88 million gold
18▶️19	Base Stat 18 - 1 Hero NFT	8.88 million gold
19▶️20	Base Stat 19 - 1 Hero NFT	8.88 million gold
20▶️21	Base Stat 20 - 1 Hero NFT	8.88 million gold, 10 Breath of God

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^{※ This guide was written based on the game status as of January 6, 2026, and its contents may change with future updates.}