The Desolate Era (Web Novel) - Book 4, Chapter 20 - Wait For Your Child

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Nagasawa crossed to Naruto Universe and was bound to Konohagakure.If Konoha is severely damaged and destroyed, Nagasawa’s lifespan will be reduced.He panicked at the thought of the upcoming Nine-Tailed Demon Fox's attack , and the thought of Konoha getting destroyed left him in despair.Fortunately, while bound to Konoha, he can obtain templates of powerful characters.At the beginning, He got the Whitebeard template! Since it's the Whitebeard from the Summit War of Marineford, he can use Tremor-Tremor Fruit's ability and Haki.Facing the Tailed Beast Ball, which terrorized Konoha Shinobi, Nagasawa leaped and shattered the Tailed Beast Ball with one punch!

When humans step into the Galactic Era, the ancient art of cultivation thrives once again.

“You’re ours,” Varen whispered, his voice a velvet threat, “and we don’t share unless it’s with each other.”I was never supposed to matter.An omega raised in the shadows, hidden behind my warrior family's shame, I only ever wanted to survive. Maybe, if I was lucky, find love with someone like me— someone quiet. Gentle. Unseen.But the moon had other plans.And under its eerie blue glow, three impossibly powerful, dangerously beautiful Alphas—triplets— claimed me as their mate.Varen. The charming firebrand with a wicked tongue and a sugarcane smile.Kiel. The silent forest poet who sings to wolves and kisses like moonlight.Thorne. The battle-scarred leader who doesn’t believe in fate... yet burns when I walk away.They were meant to lead the pack.I was meant to be nothing.Now I’m caught between them — between chaos and devotion, between savage protection and secret longing. I should have run the night they called me “mate.” But when my bloodline reveals a rare power the world thought extinct, I become the key to a storm that could tear our world apart.Betrayal bleeds through every shadow.My family sold me.My enemies want to own me.And love? It was never supposed to look like this.But maybe fate didn’t get it wrong.Maybe I was never made for one mate.Maybe I was made for them all.