Water Katana mod overview

• Adds the Watrainium material (found in shipwreck treasure and village fisher chests) and the Water Katana sword.
• Craft the katana with two Watrainium above a stick (vertical sword pattern).
• Katana combat: heals you on hit, slows targets, and right-click grants a short splash of dolphin grace and resistance with a brief cooldown.
• Key ability: while holding the katana, press J to unleash a water surge that grants water breathing/regeneration/dolphin grace, splashes particles, and knocks back/weakens nearby foes (10s cooldown).
• Utility command: /flooddesert (permission level 2 or holding the katana) when standing in a desert floods the nearby area with water.
• Custom item textures, models, recipe advancement, and keybinding entry are included for smooth discovery in-game.