Here's an example of how you could implement the skill level threshold feature in a Valheim mod:

First, you will need to find the relevant code in the game that handles the player's skill levels and death. In Valheim, player skills are stored in the player's character file, which is a binary file that contains information about the player's character, including their skills and stats.

Once you have found the relevant code, you can create a new script or modify an existing one to implement the skill level threshold feature. Here's an example script that demonstrates how you could achieve this:
```
// Import the necessary Valheim classes and namespaces
using UnityEngine;
using System.IO;

// Define the SkillLevelThreshold mod class
public class SkillLevelThreshold : MonoBehaviour
{
    // The minimum skill level threshold
    private int minThreshold = 10;

    // The maximum skill level threshold
    private int maxThreshold = 85;

    // The path to the player's character file
    private string characterFilePath = "";

    // The main mod entry point
    void Start()
    {
        // Get the path to the player's character file
        characterFilePath = Path.Combine(Application.persistentDataPath, "characters", "player.fch");

        // Load the player's character file into a byte array
        byte[] characterData = File.ReadAllBytes(characterFilePath);

        // Get the player's skill levels from the character file
        int[] skillLevels = new int[10];
        for (int i = 0; i < 10; i++)
        {
            skillLevels[i] = BitConverter.ToInt32(characterData, 152 + i * 4);
        }

        // Find the highest skill level achieved by the player
        int maxSkillLevel = 0;
        foreach (int level in skillLevels)
        {
            if (level > maxSkillLevel)
            {
                maxSkillLevel = level;
            }
        }

        // Set the minimum threshold based on the highest skill level achieved
        if (maxSkillLevel > minThreshold)
        {
            minThreshold = maxSkillLevel;
        }

        // Clamp the minimum threshold to the maximum threshold
        minThreshold = Mathf.Min(minThreshold, maxThreshold);
    }

    // Handle the player's death event
    void OnPlayerDead()
    {
        // Get the player's skill levels from the character file
        byte[] characterData = File.ReadAllBytes(characterFilePath);
        int[] skillLevels = new int[10];
        for (int i = 0; i < 10; i++)
        {
            skillLevels[i] = BitConverter.ToInt32(characterData, 152 + i * 4);
        }

        // Check if any of the player's skill levels are below the threshold
        for (int i = 0; i < 10; i++)
        {
            if (skillLevels[i] < minThreshold)
            {
                // Reset the skill level to the threshold
                skillLevels[i] = minThreshold;
            }
        }

        // Write the updated skill levels back to the character file
        for (int i = 0; i < 10; i++)
        {
            Buffer.BlockCopy(BitConverter.GetBytes(skillLevels[i]), 0, characterData, 152 + i * 4, 4);
        }
        File.WriteAllBytes(characterFilePath, characterData);
    }
}
```
This script works by finding the player's skill levels in their character file, determining the highest skill level achieved, and setting the minimum threshold based on that value. When the player dies, the script checks if any of their skill levels are below the threshold, and resets them to the threshold if necessary.
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