What elements can be included in a 10 minute long horror story?

The tens of thousands of universes have merged. The disintegration of Spiritual Force led to the momentous collapse of the great Cultivation World, a mighty era that had endured through millions of years of history. In the wake of the large-scale invasion of the Wilderness, the Avalon of Five Elements has become the practitioners’ last stand. After a thousand years, a lowly youth, who hailed from the Old Territory, toiled as a laborer for three years in the depths of the Wilderness. He then became an exception and obtained the opportunity to enter the Avalon Of Five Elements for further studies. Bearing beast-like fighting capabilities and driven by the desire to take control of his life, the youth strived for greater strength and power. Little did he know that he would set off a majestic upheaval.

Condition 1: Collect 1 Yellow Turban Soldier’s Rune (Completed) Condition 2: Defeat 100 Runic Monsters Solo (Completed) Condition 3: Kill Wild Boars in One Strike 5000 times (Completed) Condition 4: Consume 10 Runic Pills (Completed) Your Rune Can Now Be Upgraded.

The story is about a guy who got a second chance at life and greatness. This story doesn't belong to me. English is my third language, so I'm sorry.

"It can't be." a group of ninjas said as a coffin was kicked opened "That, Seth! Why him out of all people." a man with a large nose said as he took a step backward. "it seems like I'm came back to life. But who got the ball to try and control me." a red-haired man said as he walked out of the coffin. "Onoki, you have grown," he said as he began feeling out his body. "Run! this war is over. We lost." The man called Onoki yelled as he flew away. This is a story about a man who reincarnates in a world full of ninja as he went on to be the most feared man ever.

In a country town, a series of strange events begin to happen. Many rumors spread on the internet, but are soon erased by the government to avoid unnecessary turmoil. The young Liu Yang and his friends think these rumors are Internet lies to make the city more mysterious. But with each passing day, more rumors appear. It makes them a little scared. Liu Yang and his friend go to an antique store to buy protective amulets to alleviate some of the fear, even if it is fake. But Liu Yang never thought that the item he bought would be something mystical with special powers. His life will change forever the day after he buys that item.

In the middle of a Snow Storm, Avatar Aang finds an abandoned baby, taking him to Kya, soon realising that this child is special.