Hi there!
To answer your question, the Design Systems Team built the map experience using paper prototyping, user journeys and flows, high-fidelity mockups and digital prototypes that we used to test with internal Rioters. For initial concepts, this map was created through software such as Adobe XD, Photoshop, and Invision for prototyping. From there, our technical artists transformed it into code! I'll go ahead and summon Riot Biomarker so he can explain that part of the process!
We also did a big content audit for internal illustrations and conceptual artwork that existed within Riot Games but players had never seen before. Our goal being that we wanted to establish the world of Runeterra as a living, breathing place for players.
For the map terrain, artists hand painted layers in Photoshop referencing Bioluminescence's cartography work along with 3D models of iconic landmarks placed to make the world feel more real.
We are super happy that you love the map!
[sg-kiko]