All Out was preceded by the pre-release single "The Baddest" on August 27, 2020, and lead single "More" on October 28, 2020.[2] Both singles reached number one on the BillboardWorld Digital Song Sales.
After releasing "The Baddest" on August 27, 2020, the group released several teaser images starting with Akali, Evelynn, Kai'sa and Ahri with the phrase "#Wherewevebeen #KDA #CallingBlades" on their social media accounts.[3] On September 5, K/DA confirmed that they are working on a collaboration with Seraphine, a fictional virtual influencer after fans have speculated since she has been posting on Twitter, Instagram, and SoundCloud and art style seemed in line with other characters from the game.[4][5] On her in-character Instagram account, Seraphine confirmed she would serve as one of the producers for the EP.[6] Simultaneously, Riot released the first episode of their new web comic series titled K/DA: Harmonies showing behind-the-scenes of the group's recording process, members encounter, experiences and adventures.[7][8][9] On September 28, K/DA unveiled its official fandom lightstick in a shaped of a stage microphone, featuring a black criss-cross pattern on its handle, and their first fan recruitment for Blades, the group's official fandom name.[10]
"We prepared this EP album in respond to the support from fans around the world, who showed explosive interest and support after K/DA debuted in 2018."
— Toa Dunn, the general manager of Riot Games' Music Team[11]
On October 2, it was announced K/DA's debut extended play title All Out, album's official cover art and multiple pieces of promotional artwork have been released alongside the announcement.[12][13] It was reported that the lead single will be presented during the 2020 League of Legends World Championship alongside Seraphine, who was rumored to be one of the next champions for League of Legends.[14] On October 9, the group revealed the album track listing.[15] On October 12, Riot Games released new skin for K/DA's members Akali, Evelynn, Ahri, and Kai’Sa including Seraphine.[16] The skin for Seraphine is release as it evolves to become a pop star, from 'Seraphine Indie' 'Seraphine Rising Star' to 'Seraphine Superstar'. Informations about Seraphine as the champion was not clarified,[17] but, it was confirmed later the next day by Riot Games by announcing Seraphine as the new mage winner with music-themed skills.[18] On October 16, Riot Games revealed the full line-up artist which feature five different tracks, with over ten different artists.[19]
Two days after the release of "More", Riot held various events and contents prepared to commemorate the release of K/DA's first EP All Out, through League of Legends, Legends of Runeterra (LoR), Teamfight Tactics (TFT), and League of Legends: Wild Rift. In LoR, a 'K/DA All Out Event Pass' is issued. With this pass, the players get a set of K/DA's limited epic order cards, and purchase a premium event pass to get more rewards and new game mode 'K/DA Star Power'. It is a method in which the player directly selects a card from the deck with each member as the main character. In addition, 'K/DA board', special performance songs are included on the board. In TFT, Feather Knight, Fluffy Tail, Whining, Horn, and Flash will appear in a new form that based on K/DA's concept. It can be purchased as 'K/DA Little Legend Knows' or as an individual appearance from November 12. In Wild Rift, players can earn various rewards by playing the game as a K/DA member champion and performing missions and also purchase the K/DA All Out skin from LoL at Wild Rift.[20] The same day, Logitech's brand Logitech G announced they partnered with Riot Games to launch a set of League of Legends gear with a new K/DA-inspired gaming products.[21][22] Riot Games also conducts outdoor advertisements by accessing the QR code to 'K/DA Comeback Support Event' displayed on the billboard near Samseong station, Express Terminal and entrance to the Starfield COEX Mall, which are known as spots where idol advertisements are held.[23]
^Seo Dong-min (October 30, 2020). 라이엇 게임즈, K/DA 컴백 기념 대규모 이벤트 진행 [Riot Games holds a large-scale event to celebrate K/DA comeback]. Gametoc. Archived from the original on November 2, 2020. Retrieved October 30, 2020.
^라이엇, 실제 아이돌 광고처럼 지하철역에 K/DA 옥외광고 진행 [Riot, K/DA outdoor advertisement in subway station like real idol advertisement]. This Is Game. October 30, 2020.
