Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 542 - 543:

After making preparations for transmigration into the VR world “Mystical Era”, the previous veteran player Xia Yuan becomes an NPC, and is even made the fourth son of the Duke of the Empire!Already prepared for a boring aristocratic life, he never expects that the era has totally changed!As the last obstacle, his family has been labelled as a villain by the new aristocracy and will soon be crushed by history! Xia Yuan has no choice but to gradually strengthen his own power according to his knowledge of the game's history.Lost treasures, forbidden ancient weapons, secrets of immortality, forgotten epics...With one's own strength, save the world! Change fate! Rise from the ashes!...The knight swears, the mage sings, and the dragon spreads its wings!Pursue magic and truth, and control the fate of yourself and the era!Stand in the clouds, above the floating city and the throne of the sky!The bell rings, and the signs finally appeared.-It’s time for the stars to align-

In a game-like world where dungeons, monsters, and players appear.

Everything functions in a cycle, be it an ant, bird, lion, human, or even a celestial body.This cycle initiates with one's birth and governs one's end, yet there exists the potential to surpass it.Among the billions of planets floating in the cosmos, destined to merely occupy a void, some have the capacity to ascend, reaching new dimensions, standing shoulder to shoulder with realms like Heaven and Hell.---Vlad, a young man, found himself ill-fitted in a world that scarcely offered him any luck, weighed down by a mysterious secret that initially seemed more of a burden than a boon.Yet, the powers he had dismissed as trivial eventually became his most formidable strength when the apocalypse broke, unleashing literal pandemonium as angels and demons walk among the human race.

Aaron, a wildlife biologist, became a military strategist right after a global war between nations began.He never wanted to participate in the war but he had to, because he wanted to continue his studies on endangered species the moment the war was over, but to his surprise, everyone in his unit were killed, including him, and the next thing he knew, Aaron woke up in the body of a young noble having a similar name to his.However, he also noticed he had awoken in a world different from Earth.In this world, demonic beasts ran rampart with only one thought in mind, causing them to feed on anyone they see, be it humans, elves or even magical beasts as well.During his first encounter with a magical beast, Aaron awakened a system which allowed him to bond with magical beasts and to obtain terrifying abilities from these bloodcurdling magical beasts, so he used his experience as a wildlife biologist to help make it easier for him to bond with these beasts.However, Aaron also noticed he could evolve these beasts if their loyalty towards him had reached a certain level, so he vowed in his heart to grow strong enough to protect those he cared about in this world with the hope of living a happy, peaceful life where he'll be able to focus fully on his passion as a wildlife biologist.