Once you spawn in this world, first create a gate leading to the world of sin.
You can craft it using:
・End Stone Bricks
・Flint and Diamond
That world is extremely evil and has very poor visibility. Within it, find a cylindrical building made of Nether Bricks!
Then, destroy the stone statue at its center to spawn the personifications of the sins: [Wrath, Envy, Greed, Lust, Gluttony, Pride, Sloth]. Obtain these seven cores to acquire the Ke
y of Original Sin. Use it on the Original Sin Block to summon the Original Sin Boss!
Now, can you defeat this boss?

Furthermore, every mob in this mod is powerful enough to give you a tough time even with the strongest vanilla gear.