https://www.pcgamer.com/riot-releases-dark-star-chogath-league-of-legends-skin-to-raise-funds-for-charity/

Riot Games connected with the Make-A-Wish Foundation last year to grant a wish to a teenager suffering from osteosarcoma, a form of bone cancer, who wanted to visit Riot headquarters and create a skin for Cho'Gath, his favorite League of Legends character. From that collaboration, Dark Star Cho'Gath was born, and now Riot is selling skins, icons, emotes, and bundles featuring the champion, with 100 percent of proceeds going to charity. 

The teen, Bryan, played LoL during his treatment and recovery, and his parents told Riot that they could tell how we was feeling by how much he played. On the worst days he wouldn't play at all, but as his condition improved he worked his way up to a Platinum V rank. Before his visit to the studio, he "brainstormed" with Riot over email and in video chats; while he was there he provided feedback on an early version of the Dark Star Cho'Gath skin, playtested new content, and played clarinet in a recording of an official Dark Star Cho'Gath theme song.