That was Projection Magic, a spell of the air-type said to operate on the same principles as a mirage. It was originally used for reconnaissance on battlefields, but later, the grand theaters and arenas of Demon City also adopted this system, expanding its functions to what they are today.
Glancing at the crowd-packed stands, Luo Yan found it his first time to realize that the demons of Demon City actually loved such spectacles.
In this world without "Internet marketing," all fifty thousand tickets for the event had sold out within just one day.
Of course, perhaps due to the absence of the Internet, the demons of Demon City were more bored than one might imagine.
"Dear live audience members! Friends watching the broadcast! I am Agnes, the host of this duel!"
On the towering podium, a demon with four arms, yelling excitedly into a stone tablet engraved with a Sound Amplification Magic Array, successfully heated up the atmosphere throughout the venue.