Swim Skill
Swim skill in Valheim is something you should probably level up considering how much water there is in this game. You'll probably end up leveling it eventually, but getting to level 100 would be a grind. You'll unlock the swimming skill the first time you start swimming in water.
Effects of leveling swim skill
- -.4% stamina drain while swimming for -40% stamina drain at level 100 (max level)
Honestly swimming skill is pretty rough. It takes forever to hit level 100 and offers a not so great reward.