A Reincarnated Mage's Tower Dungeon Management - Volume 8, Chapter 8 – The Curse’s Reemergence

Having lived a normal life all his life and died without being able to fulfill his desire and when he’s given a task by a god, watch how he takes the protagonists girls while making it hard for the hero.

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

In the realm of Nexaria, where elemental spirits and divine beings shape the fate of the world as a land of mortals striving to become gods against the demons of the Abyssal universe, a young boy named Lassim Vanthar embarks on an extraordinary journey of advancement, adventure and becoming a bastion for those around him in their fight against the Dragal.Born into a noble family with a legacy of Fire elemental martial prowess, Lassim possesses an unparalleled gift on his 8th birthday—a connection to two differing elemental spirits, a feat unheard of in the history of his world. A gift and a tampering of the order until now that is an omen. It is a sign of the Gods influencing the future fate of Nexaria on a more serious level.Lassim must harness the power of his dual spirits to protect his loved ones and confront the looming threat of the Abyss' encroachment on his universe, but one step at a time as he grows from just a tool of the God's to a major power as the hero ofnot only Nexaria, but the entire universe.Lassim faces daunting challenges, battles fierce adversaries, and unlocks the mysteries of his own destiny that has been tampered with by the Gods of this universe. How will he react and adapt to his situations?

Gods and demons are everywhere in the Grand Desolate World.