Controlled lighting and a special fabric mesh with a metallic filament woven into the fibers created a holo-projection effect, according to ESPN. The same technology helped to realize True Damage, a fictional band that features League of Legends characters Akali, Ekko, Senna, Qiyana and Yasuo. These figures, dressed in colorful cyberpunk ware, danced, rapped and sang to accompany their human counterparts, which include artists Becky G, Keke Palmer, SOYEON of (G)I-DLE, Thutmose and Duckwrth.

Umar "Thutmose" Ibrahim performing alongside his True Damage counterpart Ekko.

The holographic projections allowed the League champions to 'glitch' out of existence and instantly teleport to another part of the stage. Occasionally, the lights would dim and obscure Thutmose so that a digital recreation could appear on suspended podiums at normally impossible angles. The 15,000-strong crowd in attendance cheered as both the human and fictional parts of True Damage gathered on stage for the final chorus. Shortly afterwards, Cailin Russo and Chrissy Costanza took to the stage to cap off the opening ceremony with a holographic-imbued rendition of "Phoenix," the official anthem for the World Championship.

Riot Games has experimented with virtual bands and technology-focused spectacles before. In 2014, the company created a fictional metal band called Pentakill with League champions Karthus, Kayle, Mordekaiser, Olaf, Sona and Yorick. The act's debut EP, Smite & Ignite, cracked the Billboard Top 40 and hit number one on the iTunes Metal and Rock charts. Three years later, a second album called Gasp of the Undying appeared with cameos by Motley Crue founding member Tommy Lee and Nine Inch Nails alumnus Danny Lohner and Noora Louhimo.

The video game developer brought an augmented reality dragon, known in-game as an Elder Drake, to the World Championship finals a couple of months later. It created a virtual K-pop girl group called K/DA the following year with popular League champions Ahri, Akali, Evelynn and Kai'Sa, voiced by K-pop group (G)I-dle members Miyeon and Soyeon and American singers Madison Beer and Jaira Burns. K/DA has released one track, Pop/Stars, which has over 280 million views on YouTube and features on the popular VR rhythm game Beat Saber.

Last year, K/DA opened the World Championship finals in South Korea with an augmented reality performance similar to 2017. While the real-life performers sang on stage, the virtual champions walked around them in a believable way that was visible on-stream and through huge monitors at the Incheon Munhak Stadium.

Riot's approach to virtual bands is a tad unconventional. Many 'live' concerts, including those for virtual pop singer Hatsune Miku and Splatoon's Squid Sisters, don't show the people who are lending their voices to the characters. It's an obvious move: Why break the illusion for an audience that is so keen to immerse themselves in it? Riot, however, is more than happy to show the human half of its fictional acts on stage. Like Gorillaz, one of the earliest and most famous virtual bands, the developer is almost coaxing viewers to Google the real-life performers and find out what else they've produced.

Is that the company's goal, though? To develop virtual bands that are malleable enough to move between genres and introduce listeners to a broader range of musical artists? The League of Legends community loves the game's characters and are, therefore, more likely to listen to an experimental track than if it randomly queued up on Spotify or Apple Music.

It's unlikely.

Pentakill, K/DA and True Damage probably serve a simpler purpose: to advertise League of Legends.