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Learn Java and code highly-customized Minecraft plugins in 20 days (without experience):

Boss

Boss is a premium quality plugin for custom monsters on your server.

• Create custom monsters that increase difficulty of your server.
• Use Bosses in monster arenas to challenge your players.
• Clean GUI allows you to configure EVERYTHING in-game easily.
• and much more! Read more here.

You are welcome to read the Boss Wikipedia, where you will find tons of information about the installation, configuring and using this plugin.

If you have any questions or bugs to report, you are welcome to fill an issue. Please read the Getting Help the Best Way to obtain help as quickly as possible.

Get it here: https://www.mc-market.org/resources/21619/