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

[User Anton Blaciel is under a slave brand. You cannot eliminate yourself from the test anymore.]

All the struggling resistance Anton made failed as the runic pattern of the slave brand appeared on his forehead. With that came a slight migraine in his head, disabling him from thinking straight. Anton did his best resisting the brand.

"This is not enough. This won't be enough," Anton muttered with a pained expression on his face.

"That's a resilient one," Ben added, looking at the leaving Scythe. "I don't think the slave brand will be able to hold him back."

Even though the slave brand was quite useful in the trial, it was not permanent, and moreover, it had a lot of flaws. If the slave had considerably strong willpower, they could deny their master's order. In the week of their test, Ben had seen many cases of betrayal among the slaves, too.

Slave