Limitless Summoner: Rise of the Soul God - Chapter 2: Run!

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

A young man that was always cautious with his life ended up dying in the most random way possible, buried by an avalanche.

As he died, within his last moments, he heard several mechanical voices resonating inside of his head, and he was granted many wishes in the form of Skills, Fortunes, and a new Body.

Now, reborn as an Ice Dragon, he is thrown into a world of fantasy that seems way too much like Norse Mythology named Yggdrasil, which is also, somehow, a Cultivation World?

What a weird mashup of concepts!

Accompany him as he explores this world, survives against the deadly monsters that roam this world, and fights to find a place to belong to, and a purpose to this new life.

However, he is not the only Reincarnated who was given wishes, and soon enough, the world he was thrown into will be engulfed in complete chaos.

In a world where the boundaries between dimensions are thinning, a young man named Kael Ardent is thrust into the Eternal Nexus, a realm where countless worlds converge. Here, the laws of reality are dictated by Aether, a mystical energy that fuels both creation and destruction. Kael discovers he is a Nexus Warden, a rare being capable of manipulating Aether to bridge worlds and command the forces of the Nexus.But the Nexus is not a place of peace. It is a battleground for Eldari, ancient beings who seek to control the Nexus and use its power to dominate all existence. Kael must navigate this treacherous realm, forge alliances with warriors from other worlds, and unlock the secrets of his own latent powers. As he grows stronger, he uncovers a prophecy that foretells the rise of a Prime Warden, a hero who will either save the Nexus or doom it to eternal chaos.