MTL - Treasure Hunting Divine Eyes - Chapter 786 clue

I became a mage character from my favorite game.

Heartbreak was the worst thing Kanata thought he’d face this week. He was wrong.When the world begins to rot and the dead rise, survival becomes the only thing that matters. Trapped in a school turned slaughterhouse, Kanata finds himself side by side with unexpected allies—his sharp-tongued childhood friend, a fierce upperclassman with a blade, and a dangerously calm teacher with a mysterious past.With betrayal still fresh and the world falling apart, Kanata isn’t looking to be a hero. He just wants to stay alive.But in the apocalypse… staying alive is the hardest part.

The world experienced a cataclysmic change, and countless spatial gateways appeared out of thin air.

Exotic beasts of all shapes and sizes swarmed out of those aforementioned spatial gateways, forcing the humans to face the crucial moment for their survival.

In order to search for a chance at survival, brave warriors from the army and scientific researchers risked their lives and entered the world beyond the spatial gateways. To their surprise, they discovered that there was a chance of obtaining beast cards by killing these exotic beasts in their world.

Those with extraordinary spiritual strength are able to utilize the beast cards, perhaps transforming the cards into the beasts’ combat bodies while they were still alive, or transforming them into weapons or defensive gears, or…

A new occupation came into existence following the changes, known as beastmasters.

A transcender with two souls fused into one found himself in this magnificent new world full of waves, rising step by step as he ascends into the seat of a godly beastmaster.

- Description from Novelupdates

Link was the top Archmage in the entire server. He had just defeated the strongest boss, the Lord of The Deep, Nozama with his party. However, instead of going back to town, he was transported to a secret location with pixelated CG.