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The Persona Device lets creators define an NPC's personality in roughly 20 lines of prompt text, choose a voice type and delivery style, and deploy characters that generate unscripted responses in real time. According to Epic's official developer documentation, the device manages conversations using a large language model session, and the Darth Vader NPC described in Practice 2 was built on the same underlying technology stack, with an AI voice synthesis layer on top. Epic announced wider creator access for later in 2025. The tool represents a shift from traditional scripted game dialogue — where writers pre-author every line — toward AI-generated conversation that adapts dynamically to each player interaction.
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