# Node Fusion
Node Fusion is a core mechanic that allows you to combine **two existing nodes into a single, more powerful node of a higher tier.**
#### Fusion Rules
To perform a fusion, you must meet several specific requirements:
You must fuse two nodes **of the same tier to create one node of the next higher tier.**
Neither node can be currently deployed in a datacenter or undergoing an extraction cooldown.
Superior tier nodes **cannot** be fused because they already represent the highest possible tier in the system.
#### Fusion Costs
Fusion requires the payment of $HASH tokens. The cost doubles with each subsequent tier level:
• **Common to Uncommon:** 2,000 $HASH
• **Uncommon to Rare:** 4,000 $HASH
• **Rare to Ultra:** 8,000 $HASH
• **Ultra to Superior:** 16,000 $HASH
#### Skill Slot Preservation
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A critical rule for fusion is that **both nodes must have the same number of passive skills** to be eligible.
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The resulting fused node will retain the same number of skill slots as its "parent" nodes. While the number of slots is preserved, the actual skills are not.
All skills are randomized (re-rolled), and their power levels are adjusted to match the ranges of the new, higher tier.
#### Fusion Randomness
The properties of the newly created node are determined using the platform's [provably fair on-chain randomness system.](/core-concepts/how-to-know-that-it-is-truly-random.md#verifying-randomness)
Data Sources: Random values are derived deterministically from the transaction slot, timestamp, your public key, and a unique client seed.
Attribute Mapping: For fusion, the system generates four random values: the first determines the new hashrate, and the subsequent values determine the skill type and power for each preserved skill slot.
Verifiability: Because these values are logged on the Solana blockchain as a commitment hash, you can independently verify that the outcome was not manipulated after the transaction is confirmed.
#### Strategy Implications
**Upgrading Degraded Nodes**
Fusion serves as a primary method for dealing with permanent hashrate degradation caused by repeated repairs. Instead of mining with a weakened node, you can fuse it to "reset" it into a higher-tier node with a fresh hashrate range.
**Skill Power Scaling**
Since fused nodes roll skills at the new tier's power ranges, fusion is a strategic way to obtain higher percentages for [passives](/core-concepts/passive-skills.md) like Event Shield or Deterioration Reducer.
**Slot Preparation**
If you want a high-tier node with multiple skills, you should use [Flux Expander](/core-concepts/items-and-inventory.md) items to add slots to your lower-tier nodes before fusing them. However, you must ensure you add the same number of slots to both nodes to satisfy the fusion rules.
**Superior Tier Path**
Fusion is the only way to reach the maximum potential of the Superior tier, which allows for up to 4 passive skill slots, providing the most powerful combinations for long-term mining
***Read more:***
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[Items & Inventory](/core-concepts/items-and-inventory.md)
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[Passive Skills](/core-concepts/passive-skills.md)
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