Just a few suggestions/ideas.

• Add material variants for the knife. I.e, Diamond, gold etc.
• Maybe an EnderFlask for Splash Potions, or a sling. (For holding more splash potions)
  -More vanilla enchantments for Hammer and Knife. I.e, Smite for Hammer and Sharpness for knife.

Love your mod! Thank you for taking the time to make it!

Thank you for the suggestions, I added potion launcher (ender flask for splash potions) and vanilla enchantments for hammer and knife in the newest update.