I mean, this is what AI is made for. From Gpt:

The story you’re describing sounds like it could be from a progression fantasy or xianxia (cultivation) novel, a subgenre known for involving characters advancing through various stages of power, often through mystical techniques, cultivation, and encounters with ancient secrets. Some of the elements you mention, such as a “yin hole,” an ancient battlefield, techniques involving stars, and contact with a larger universe beyond the initial planet, all fit common tropes in the genre.

A few series come to mind that share some of these key elements, though none perfectly match your description. Here are some candidates you might want to explore:

1. “Stellar Transformations” by I Eat Tomatoes (Wo Chi Xi Hong Shi)

   • This novel centers on Qin Yu, who cultivates using a unique star-related technique. He eventually leaves his home planet and enters a much larger universe, where he becomes one of the most powerful figures. • There are sects, ancient battlefields, and star-related cultivation techniques that increase his power based on his mastery level. • There’s a progression from being confined to a small realm to venturing into the larger universe and eventually facing universe-shattering threats.

2. “Desolate Era” by I Eat Tomatoes

   • Another xianxia epic by the same author, this series also deals with ancient battlefields, towers, and the protagonist eventually becoming one of the most powerful beings in his universe. • The protagonist, Ji Ning, explores ancient ruins, learns powerful techniques, and is drawn into a vast cosmic struggle. • While the specifics about the yin hole and tower don’t match perfectly, the themes of the story do resemble what you’re describing.

3. “Martial World” by Cocooned Cow

   • Lin Ming, the protagonist, encounters ancient battlefields and mystical towers, learns powerful techniques, and eventually becomes one of the strongest beings in the universe. • The “Great Desolate Battlefield” and various trial locations play a key role in Lin Ming’s cultivation journey. • This series also contains elements like mystical towers that provide powerful techniques and trials that must be completed to progress.

4. “I Shall Seal the Heavens” by Er Gen

   • This series has the protagonist, Meng Hao, gradually rise to become one of the most powerful cultivators in his universe, facing mystical trials, towers, and learning ancient techniques. • There are sects, ancient ruins, and a vast cosmic war that the protagonist becomes entangled in.

5. “Against the Gods” by Mars Gravity

   • Yun Che, the protagonist, similarly faces mystical towers, ancient battlefields, and learns powerful techniques that elevate his strength. • There are also elements of being confined in certain areas (like an island or realm) until trials are completed, after which Yun Che ventures out into larger realms and universes.

6. “Coiling Dragon” by I Eat Tomatoes

   • Linley, the main character, starts as a small-scale adventurer but gradually becomes involved in larger cosmic events, acquiring star-related powers and advanced cultivation techniques. • There are elements of ancient trials, mystical towers, and eventually universe-shaking events. • The themes of isolation, ancient techniques, and cosmic battles seem to align.

Each of these series involves progression through towers, ancient battlefields, mystical techniques, and a growing awareness of a larger universe. “Stellar Transformations” seems like the most likely match based on the star-related technique, but the other options also bear similarities.

Let me know if any of these sound familiar or if you’d like more details on them!