Cyaven is a cyan accented amoled theme for the Vendetta discord mod.
You need Vendetta installed on your device to get the themes work.
Copy the raw link and paste it in Settings -> Vendetta -> Themes -> Plus Sign
to install the theme.
Raw link:
https://raw.githubusercontent.com/jaxellis/Cyaven-amoled/main/CyavenAmoled.json