Boss Lifesteal Mode

When a boss drops below a set health threshold, it enters Lifesteal Mode — gaining the ability to recover health whenever it causes a player death. Once triggered, the effect stays active until the boss is defeated.

⚔️ Features

• 🔥 Configurable boss lifesteal system (JSON-based)
• 💀 Activation threshold per boss (e.g. 30% HP)
• 🧠 Supports flat, percent, or full healing
• 🎯 Works with vanilla and most modded bosses
• 💬 Randomized chat messages for lifesteal events
• ⚙️ Fully server-side (no client install required)

💀 How it works

• Boss reaches the configured HP threshold
• It enters Lifesteal Mode
• Every time a player dies to it, the boss heals
• The effect stays active until the boss is killed

🧾 Configuration

Each boss is defined via JSON config:

• Entity ID (e.g. minecraft:ender_dragon)
• Activation threshold (0.0 – 1.0)
• Heal type:
  • Flat heal
  • Percent heal
  • Full heal
• Heal amount (if applicable)

🌍 Compatibility

• Works on Forge 1.20.1
• Server-side only (clients don’t need the mod)
• Compatible with most modded bosses as long as they are registered entities

💡 Author's Note

I made this mod to add some degree of challenge for my own server's boss fights. Our server has keepInventory enabled so this aims to somehow make the boss fights difficult for my players. I have no intention into making it bigger, unless something would motivate me to do so. 

Let me know if something doesn't work. I at least still want to make this mod work perfectly. Have fun!