I think the current Vanilla Ender Dragon Bossfight doesn´t look like a REALLY bossfight so...
I took it personally

In this plugin you will fight an improved version of the regular Ender Dragon with new Attacks, including more enemies and abilities. Not to hard if you have very well equipment, but nearly imposible to that tryhard player who always kill the dragon with Stone Axe and crossbow.

There is one new command: /dragon
Most of its parameters are op only, but if you are skill issuing and want to know how to fight the Ender Dragon you can do /dragon guide to obtain a book guide with everything about the Bossfight

See more of my plugins here: https://www.spigotmc.org/members/markmanflame_55.1805917/