There are several community-driven websites dedicated to archiving screenplays.
While these databases focus on live-action films, Arcane ’s popularity has led to user-uploaded transcriptions. As of this writing, Script Slug does not host Arcane , but sometimes features fan-made PDFs. arcane episode 1 script link
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Given the massive success of Arcane and the upcoming expansion of the Riot cinematic universe (new shows set in Noxus, Ionia, and Demacia), there is a small but real chance of an official "Art of the Screenplay" book. Script Slug does not host Arcane