This data pack adds the Lavarite Sword, the Sword of Knockback, and the Double-Bladed Iron Axe! It can be crafted in any game mode and is very fun to do PVP with. Also, there is a function called effect_healthboost, which adds an extra row of hearts to your health. You can use it by doing the command /function crafting:effect_healthboost Crafting recipes in the pictures.
      
IMPORTANT - Remember to put the resource pack on. Also, the Resource pack and data pack are in the same folder just unzip it and there will be two zip files, the resource pack, and the datapack.