ZombieMonarch

This is a Minecraft Bukkit/Spigot plugin that introduces a special mob called the "Zombie Monarch."
At night, zombies have a configurable chance to spawn as a "Zombie Monarch" with a custom name and enchanted diamond armor.
If a spawner has a diamond block above it, it can spawn a Zombie Monarch at night instead of the usual mob.
When a Zombie Monarch drops below half health, it summons a configurable number of zombies and skeletons with iron armor.
The Zombie Monarch can explode if a player (especially one holding a shield) comes close, after a warning and a short delay.
A boss bar is shown to nearby players when a Zombie Monarch is present.
When the Zombie Monarch dies, all mobs it summoned are killed (if enabled in config).
All features and parameters (spawn chance, armor, explosion, messages, etc.) are configurable in the config.yml file.