You can use the ValheimLib library to facilitate Valheim modding. You can also use the JotunnModExample project template as an example mod project that you can clone, open and compile for Valheim.

To make a mod for Valheim that made it so that you had a skill level threshold you couldn’t go under when you died, you would need to modify the game’s code. You would need to add a new variable to store the skill level threshold and then modify the death penalty code to check if the player’s skill level is above the threshold before applying the penalty. Here’s an example of how you could implement this:

```java
public class SkillLevelThreshold : MonoBehaviour
{
    private int skillLevelThreshold = 10;

    private void OnPlayerDeath()
    {
        int woodcuttingLevel = Player.m_localPlayer.GetSkills().GetSkillLevel(Skills.SkillType.WoodCutting);
        if (woodcuttingLevel >= skillLevelThreshold)
        {
            // Player doesn't lose any levels
        }
        else
        {
            // Player loses levels as normal
        }
    }
}
```

This code checks if the player’s woodcutting skill level is above 10 before applying the death penalty. If it is, then the player doesn’t lose any levels. Otherwise, they lose levels as normal.
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