silent_walker

The Maha Tower or The Broken Tower of Omega—some call it. It is a place of Dream, a place of myth, and a place of Chaos. Only a thousand among many get the chance to climb it each year.
Wrik spent years to find this tower, ignoring his studies, University, but to no avail. Until a day when a letter came to his door with a pair of tickets to the tower.
But before that, he had to appear in gruesome trials to enter the cruel Tower.

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Check out the other works: 
Chaos Cycle: The Eye of Genesis.
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[The novel is a bit slow compared to other webnovel. It picks up the pace from the 10th chapter or so.]

Broken Tower Saga : The First Swordsman

Wrik's eyes widened and felt little goosebumps in his arms. The item Ryat brought out something he was very much familiar with. This key of weird shape was something he got one as well—he got through luck in the wheel of fortune in the trial sanctuary.

At that time, he had no idea what it was, nor now, but he had a deep intuition about it that was related to something broader and the scene before him proved him right. At first, when he touched the item, he felt an unimaginable amount of greed and the urge to possess the item. He could tell it was some effect of the key, yet he did not let go of it.

"I reckon you have one of these as well?" the bald man asked, giving him a clear look at the key.

Wrik thought for a second, then gave a small nod. There was no way to hide it now. "Is this the reason they assault us?" he asked. It was almost incomprehensible to him.

The Reason (2)