Venus is a uninhabitable planet located in the Sol System of where the human civilization are from. Venus is the 2nd planet from the Sun. It was habitable millions of years ago, but it was made unhospitable by the Carylonian civilization when they left it. Earth was Ground Zero in the Carylonian-Peurobian war and there was also a massive space battle between Earth and Venus.
30 million years B.C.E, a civilization known as the Carylonians settled on Venus and established an own empire. The Carylonians are known to be a group of people that separated from the Xurunian civilization from the Xurunia/Andromeda Galaxy between 8.5 to 9.5 billion years ago.
In 25 million years B.C.E, a war broke out in the Sol System between the Carylonian civilization and an ancient civilization that lived on planet Earth known as the Peurobians. It was damages on both Venus and Earth, but the Peurobians got the most damage where the population decreased from 3.5 billion to almost 1/4 of a million. A couple hundred thousand Carylonian soldiers lost their lives and around 2 million humanoids The Carylonians escaped the Sol System and never returned back. It was never known where they went in the universe until sometime later.