The next generation Terraria API.
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Orion is the next generation of Terraria Server APIs.

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Orion is a modern, cross-platform, service-oriented library which makes it easy to write server plugins for Terraria, and serves as the API replacement for TShock v5.

It sits in between Terraria server plugins and Terraria itself, and serves as an abstraction layer between the plugin and the server. With it, plugin authors will be able to interact with Terraria components on a higher level, saving the amount of effort required to extend Terraria Server's functionality