What You Need To Do
All you have to do is get Brawler Skill Tree
The Brawler Skill Tree if for killing your enemies and getting more loot and other perks and since the game adds more enemies to some spots and changes their Hp and Dmg it is good to go only for this Skill Tree.
And Posion Arrows
The arrows Instant kill all enemies except some wildlife which you don’t have to deal with after the bear level.