Atlantis

Atlantis was an ancient city-state, located on a large island off the coast of Thera in the Mediterranean Sea. The city was built in three circular sections.

History
The people of that island were visited by an alien species, known as the Atlans, who taught them the secrets of the Orichalcum. Three Atlans took positions of leadership -- Tihocan, Qualopec, and Natla. Under the leadership, Atlantis flourished and produced powerful artifacts and advanced technology.

Natla began to abuse the power of the Atlantean Scion, and was subsequently banished and imprisoned in stasis. The Scion was broken into three pieces, with Tihocan and Qualopec each holding onto a piece of it themselves. Eventually, however, they passed away and were buried in lands outside of Atlantis with their pieces of the artifact.

In 1600 BCE, the final God-King of Atlantis came to power -- the power hungry Nur-Ab-Sal. Under his reign, Atlantis built a powerful army and navy, with dreams of dominating other nations of the world. The world, however, had other plans. Around 1500 BCE, the volcano on nearby Thera erupted -- threatening the safety of Atlantis. In a last ditch effort to save the city-state, the Jewel of Atlantis was activated -- with disastrous effect, as it ultimately sank the city. Many Atlanteans (and a few Atlans) were able to flee to the safety of other lands, such as Iceland, but most were trapped within the city's circular walls.

The Atlanteans built airlocks into the walls of their city to protect themselves, and used advanced mining technology to expand their city inwards. To save the Atlanteans, a decision was made to transform them into Atlans -- and so the priests of Nur-Ab-Sal built a God Machine. The Machine failed, however, and only mutated those it was tried on into twisted and deformed beings. The subhumans revolted -- massacring the inhabitants of the city. Nur-Ab-Sal placed his living spirit into a necklace. A small handful of Atlanteans managed to use the mining technology to escape the city -- carrying the necklace with them.

Atlantis was all but forgotten for centuries, lying mostly beneath the ocean, until the Nazis set out in search of it in 1939 CE. Looking for clues, they were ultimately led to Indiana Jones and Sophia Hapgood. Although they beat the Nazis to the sunken city, misuse of the God Machine caused much of the city's ruins to collapse.

But that was not the end of Atlantis' story -- for on July 16, 1945 CE Natla was freed from imprisonment. She spent decades adapting to the world, forming an identity for herself, and attempting to find the missing pieces of the Atlantean Scion. In 2020 CE, she hired Lara Croft to find the pieces. Lara did so, only for Natla to take it forcibly from her and order her killed. Lara survived and pursued Natla to an island in the Mediterranean -- the only part of Atlantis to have survived complete destruction and stay above the wave. Natla, it turned out, sought to raise an army of mutants to attack humanity, ensuring only the strong would survive. Lara managed to defeat Natla, stopping her plan, and destroying the remaining ruins of Atlantis in the process.