Create Minecraft Boss?

As
- in Mods
1

I would like to have a real boss fight with my boyfriend.

I think it would be coolest if I could adjust the strength and life of this boss myself. If you know any MODS for the 1.12.2 then please answer🙃 (Not Custom Npc Mod that doesn't quite work for me)

is

The "Boss Mod" is pretty good