MCPE/Bedrock Bossborn Addon
Bossborn adds 10 new bosses to your game as well as a ton of weapons and loot for them to drop and a soundtrack for all of the bosses. It is completely survival-friendly.
Everything you need to know is in the video below
All boss fights are in the video below
To spawn all the bosses you will need a boss table
All Boss Loot
This video explains how to install and use addons