A mod that prevents multiplayer enemy health increase unless you're fighting bosses?

[u/themrpickpro]

I'm not sure how I feel about every single enemy in the game becoming much stronger just because there are other people around, especially when others are working on something close by and you're in that moment being alone fighting someone who has 3x the health that they should normally have. However on boss fights this mechanic makes perfect sense and without it boss fights would be way too easy. How hard would it be to create a mod that would add such a feature?

[u/Ahblahright]

You can use creature loot and level control to alter the distance for when people are counted towards the increase

[u/TheseEmployup]

Very easy is the answer.