Knives Skill
Knives skill in Valheim determines how powerful your knife is. Knives are a strange class of weapon, they're fast, have good stamina usage, but have horrible range requiring you to be point blank on enemies to hit them. Leveling knives won't help with range, but it will help with damage.
Effects of leveling knives skill
- +1% damage per level for +100% damage at level 100 (max level)
Honestly it's probably better to use other weapons simply because of the low range of the knife.