This mod adds new gems that you can equip in the new "Buffs" slot.
In order to find the new slots, find the light-gray button near your "player" icon in the inventory then you will switch.
You get these gems from 3 new bosses and a secret final boss. These gems are a high risk but a high reward, the bosses to get them are tough but they give you permanant buffs.
List of mod elements:
4 mobs,
1 block,
2 items,
2 tools (not including Gems),
5 gems and
12 achievements.

All It Adds

First off, it adds a boss called "The Strongest One", It has lots of health and damage but it is very slow and shoots strong lightning projectiles. But its drop is very rewarding because you get The Strength Gem, when it is equiped in the new "Buffs" slot, you get 2 more base damage permanently unless you unequip it.

Another boss is the "Platium Speeder", it has low health and damage but have lots of speed. This drops The Speed Gem which makes you really fast.

The next boss is the "Distorted Heart", it can fly and it launches heart projectiles. Its drop is super rewarding because it gives you 5 more hearts!

The final and strongest boss is the only boss that you cannot craft its spawn egg, instead you have to locate the new "Unholy Fortress" where you get "The Godly Summoner" which once you place it you summon the final boss "???" or "unknown". It has tons of health and damage and it shoots lightning. When defeated you get The Godly Gem which gives you 10 more hearts, 5 more damage, and it makes it so you cannot anger enderman or piglins and you cannot fall through powdered snow.

Also, if you put together lots of items, you get the ultimate gem which is like a cheaper but kinda worse Godly Gem.

Notes

All the bosses in this mod are hard to beat so Good Luck!