Xen Infection addon

Here's how it works:

• The Xen Infection spreads across the world, corrupting blocks, structures, and mobs.
  
• Infected terrain slowly expands over time, transforming biomes into a hostile alien landscape.
  
• If left alone, the infection will consume everything, making survival increasingly difficult.
  
• Xen-Infected Entities – Mobs infected by the Xen parasite become stronger, more aggressive, and harder to kill.
  
• Boss-Level Threats – As the infection spreads, it may spawn Xen monsters and powerful bosses that pose a serious challenge.
  
• Fire, explosives, or special cures could be the only way to remove infected blocks.