The mod adds 4 new biomes, icy plains, boiled valley, tormented forest and flaming forest, each biome brings new entities and mini bosses.
In the icy plains biome, you will have to kill the frost ghost, in the boiled valley biome, you will have to kill the magma golem, and in the tormented forest biome, you will have to kill the electrified zombie.
In the depths of the end islands, you will find a new ore called endsteel, which can create armor and tools more powerful than netherite, which will help you in your gameplay.
With a charged staff or a painite glaunted, you can press the C key to launch a fireball, G to launch a frostball and R to launch a electrified charge.
If you have the ghast blessing effect, you can launch a firecharge pressing the C key.
To kill the new mobs, it is recommended to be very strengthened.
Here are the weapon and potion recipes to help you with your gameplay:

You will have to kill the three mini bosses to be able to summon the final boss and a reference boss.
The mod also brings some more features that can help you on your journey.