Gao Wu: I Become Stronger by Devouring Monsters

The year is 2146 AD. A hundred years ago, a huge crystal tree appeared out of thin air in the sky, suspended in the sky, and blocked the sun. A small number of residents of Blue Star were affected by the huge crystal tree, and a mysterious power was born in their bodies, also called "original energy". Disasters also followed. In order to compete for the Crystal Tree, alien civilizations descended on Blue Star and quickly occupied many cities on Blue Star with overwhelming technological power. Humanity concentrated all its technological power to erect giant barriers in ten cities, eventually forming ten giant cities with tens of millions of people. The protagonist gets a mysterious Rubik's Cube, in which lives a very powerful male elf and a witch. The elf teaches the protagonist Bai Xuran a special skill. As long as he keeps devouring monsters, he can become stronger. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.