Ryuu Kusari no Ori -Kokoro no Uchi no “Kokoro”- - Chapter 3.5

Known as the country’s top onmyoji, Yuuma Kisaragi, who lived to the age of 99, awoke to find himself in an unfamiliar forest. A voice echoed in his mind, revealing that he had been reincarnated into another world at the age of 20.“Good morning, Master. Skip the greetings and please defeat the goblin in front of you.”The voice belonged to a skill acquired during reincarnation called “AI,” designed to assist Yuuma in his new life. When the skill, AI, took over the form of a golden-haired fox yokai, the familiar shape of Yuuma’s shikigami, he decided to embark on a new life alongside AI-chan.The onmyoji and AI-chan’s second life began, tackling various challenges and formidable enemies with the strongest spells and shikigami.

That day, the breath of the great whale dispersed the fog, and a new era arrived.Chen Qi accidentally transmigrated into the steampunk-apocalyptic game world of 'New Sun,' starting with the monstrous talent “Deep Sea Affinity,” where ancient deep-sea creatures saw him as one of their own.Although he possessed the talents of a monster, as a transmigrator, he still maintained the original intentions of humanity, striving to level up with the firm resolve to become a world-renowned Monster Hunter.Finally, after his relentless efforts, the popular Dove Times sharply commented:“From the ancient deep sea, a scoundrel with evil bloodlines who threatens witches with tentacles, the arrogant lone Emperor of the Fifth, who aims to conquer the Witch Sea!”False news, blatant false news!Even though he grew tentacles, threatened witches, raised sea dragons, collected tolls, and sang the death chorus with sea monsters.He was truly not of any Deep Sea Ancient God's bloodline but a dedicated and responsible Hunter.Chen Qi cut down the fleet before him and earnestly clarified.

In this world, orphans or just anyone without any hope for this world can apply to become a “walking target”. Their sole purpose is to be a practicing dummy for the students of the sect who train to become “Demon Hunters”. These students need “walking targets” to test their training on living, walking beings of flesh and blood.
In exchange, they will be provided with food & shelter.
Their existence value is lower than a slave, but if they manage to survive a few years they can receive a life long pension.

Xiao Han is such a “walking target”. One time he witnessed a powerful Demon Hunter disposing a demon. When the demon died, a fragment of the demon that managed to escape entered Xiao Han’s heart. No one saw that, and even Xiao Han himself only felt some discomfort for an instant.

But that thing in his heart soon gave Xiao Han visions, and the first one is of a cultivation method which allows Xiao Han to absorb damage to enhance his body. A perfect cultivation method for a “walking target”.

- Description from Novelupdates