This mod adds you guessed it the Chaos Emeralds to your world and to start in this mod you will need to find 6 Chaotic Mineral which will then be used to craft Strange Orbs Then to Summoning tables.
The Summoning tables are used to summon floating islands that house the Chaos Emeralds for the first Emerald you will need a Nether star and for the rest, you will need Chaotic essence, Chaotic essence can be found spawning alongside the Chaos Guardians and if you want to continue in your journey of obtaining all 6 of the Emeralds you will need the essences because they are used to craft the other summoning tables that correlate to the Yellow, Purple, Gray, Blue, and Red Chaos Emeralds. and for the bosses, you WILL NEED PROTECTION IV and other armor enchantments will be VERY helpful because IF YOU DON'T THEN YOU WILL BE ONE SHOT. and finally, I recommend getting JEI for the crafting recipes because I'm way too lazy to go into detail on how to craft everything on here.
If there are any imbalance issues make sure to let me know in the comments
Also, check out my simple bag mod it might help out storing the number of Rings you'll need. (which is a LOT)
https://www.curseforge.com/minecraft/mc-mods/unearthlys-simple-bags