I’m a Mage, So What’s Wrong with One-Shotting a Boss?

[Online game, invincible, System, hidden class, game merges with reality, competitive gaming, fight monsters and level up] The Calamity game descends upon Blue Star, merging with reality and plunging humanity into a chaotic era where the strong prey on the weak. Chen Shan unexpectedly draws the only hidden class: the six-star Chaos Mage. He commands every school of magic, including ice, fire, wind, thunder, and light, and possesses the SSS-rank Chaos Power talent, which boosts his class's damage by 50% to 150%, making his attacks devastating. What? Mages run out of mana? Sorry, I have the Nine-Star Concentration Art. My skills cost only 0.01 mana to cast, so I can never run out. I also have the SSS-rank Divine Blessing talent, which lets me upgrade skill stars and strengthen skill effects. With such a lucky start, Chen Shan vows to climb to the pinnacle of power this time, looking down on all living things and reigning supreme for all eternity.