To implement the skill level threshold mechanic in Valheim, you will need to modify the game's code using programming knowledge and experience with the specific game engine and tools used by the game. Here is an example code that demonstrates how you can implement this feature:
```csharp
// Define the starting threshold level for all skills
int skillThreshold = 10;

// Loop through all skills and update the threshold based on the highest level achieved
foreach (Skill skill in player.skills) {
   if (skill.level >= 85) {
      skillThreshold = 85;
   } else if (skill.level >= skillThreshold) {
      skillThreshold = skill.level;
   }
}

// Check if the player's skill level is below the threshold when they die
foreach (Skill skill in player.skills) {
   if (skill.level < skillThreshold) {
      // If so, deduct levels as normal
      skill.level -= 1;
   } else if (skill.level > skillThreshold) {
      // If the player has already lost levels, set it to the threshold level
      skill.level = skillThreshold;
   }
}
```
This code loops through all skills and updates the threshold based on the highest level achieved, up to a maximum of 85. It then checks the player's current level against the threshold, and deducts levels as normal if it is below the threshold. If the player has already lost levels, it sets the skill level to the threshold level. This should provide a comprehensive and accurate implementation of the skill level threshold mechanic in Valheim.

However, please keep in mind that creating a mod can be a complex process, and requires a strong understanding of programming, game development, and the specific tools and engine used by Valheim. If you are not experienced with these things, you may want to seek assistance from someone who is, or consider using a pre-existing mod that provides similar functionality.
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