Riot Games have pulled in other studios to make games in the LoL

Multiple titles are already in development, according to the press release, to be published under the label "Riot Forge…
Multiple titles are already in development, according to the press release, to be published under the label Riot Forge.

Riot Games to Independently Broadcast LoL Champions Korea This Year

League of Legends studio Riot teases new games

Riot Games (Page 11)

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Has Epic Games bought riot? - Quora