Astral Pet Store (WN) - Chapter 1201: Chaotic Battle

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

I was a fool to believe that I, a mere red, could play God.A fool to think I could change the world, to balance evil with good.A fool to trust that those dearest to me would always remain by my side.In this world, where blood reigns supreme, a single misstep is all it takes to lose oneself.Ren, my dear little brother,I hope you still watch over me, even though I am unworthy.I’ll be with you soon—just wait a little longer.If you always want to stay up to date, find out when this book will be physically released, when the manhwa of Origins of Blood will come out, or see more content like novel art, then join my Discord server!

A young middle school student faces a life-altering choice. Destined for mediocrity and without a War Spiritual Bloodline, he dreams of transcending his ordinary existence and becoming a high-status War Spiritualist. His world is transformed when he becomes bound to the “”Godly Pet Evolution System,”” enabling him to activate his War Spiritual Bloodline and cultivate divine pets, even from the most unlikely sources.Armed with this system, he defies expectations by nurturing underdog spirits into formidable allies. The seemingly weak flower spirit evolves under his care, as does his Lord White Dragon, challenging the mightiest thunder-attribute battle spirits. Even when presented with a Diamond Demonic Spirit Card, he counters with three Epic-Demon Spirit Cards of his own.His journey takes an unexpected turn as powerful entities, including the Six-Tailed Demon Fox, the Phoenix Holy Maiden, and the Queen of the Seas, vie to become his second battle spirit. Faced with a wealth of choices, he refuses to settle for just one and ambitiously aims to harness them all.

After the last elemental high tide ended, the world entered the “Great Ebb Tide Era”, and countless races such as elves, giants, orcs disappeared in the long river of history. However, the continuation of life has its own way. After a long time of accumulation, the blood of ancient alien races gradually merged into human beings.

You have the blood of a giant, become my warrior, and I will let you look down on the common people again;

You have elven blood, join me, and I will let you feel the call of the moon god;

You have the blood of an ancient dragon, show your surrender to me, and I will make you the apex of the gods!

I am the blood lord, I have the ability to awaken the power of blood, my name is Robin.

This is a system, lord, war article, I hope you like it

- Description from novelbuddy