Civilization Battleground: From the Start, I'm a Max-Level Boss Crushing All Worlds

The boundless universe is home to countless civilizations! Ranked by strength, with the mightiest at Level Nine and the weakest at Level One, Blue Star is the lowest-ranked civilization! ... A game called Civilization Battlefield descends into reality, forcing Blue Star to compete against the universe's many civilizations. Just after 100,000 elite players enter the interstellar battlefield, they are massacred to the last! Xuyuan is reborn with his memories intact, before the game begins, and swears not to let the tragedy happen again. When he reaches Level 100 and leads a million elite Blue Star players back onto the interstellar battlefield, the System suddenly activates, twenty years too late! [BOSS Comeback System activated!] [As a BOSS, your level must be higher than the players'. Reward: base level x10!] [As a BOSS, your attributes must be higher than the players'. Reward: base attributes x10!] [As a BOSS, you must have underlings. The Host has already recruited a million underlings. Reward: all underlings' levels x1...