MTL - Rebirth 90s: Sweetheart Cub - Chapter 514 karma, reincarnation

The Principality of Atall lies between two great powers: the Kingdom of Allion to the west, and the Holy Dytiann Alliance to the east. Leo Attiel, the second-born prince, was sent to Allion as little more than a hostage, where he studied and trained in the military arts under a frontier general. And now, the times have reached a turning point.

Relations between Allion and Conscon Temple, a neutral land adjoining Atall, have worsened. Percy, sent from Atall as reinforcement; Camus, a warrior monk; and Kuon, a mercenary from a remote region, join forces to resist the looming threat of Allion’s army.

At the centre of the fighting, the three of them and Leo are about to have their fated encounter.

Emperor Hegemony, Emperor Might, Saint Sage, Supreme Realm cultivators too! A youth who was determined to become a peerless powerhouse had his dantian destroyed due to an accident. Was that a disappointment, or a desire to become stronger? The youth, Ling Xiao, had unintentionally obtained a cauldron, a sword, and watched as Ling Xiao completed the legends that no one had broken since ancient times. He had done everything he could to surpass the heavens and reach the supreme peak! Holy Emperor's fans 423840230!

A high school student that has lived as a mob-character ―― Mimori Touka

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.