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Astra-Trail, also called Saturn Galaxy FN Swapper, is a visual customization tool for the game Fortnite. It lets a player swap emotes, skins, pickaxes, backblings, gliders, and wraps with different cosmetics, including ones that are unreleased or no longer available in the game, by scanning the game's memory for the current offsets and injecting the chosen visuals into the running game client. The tool is configured through a YAML profile file where you specify which skin to show, which emotes to replace and with what, and performance settings like injection delay and memory access mode. Profiles can be shared between users so someone can copy a configuration and apply the same look. There is also a command line interface for launching the tool with a profile, dumping the current offsets to a file, listing saved profiles, or injecting a specific emote or skin directly. It includes optional connections to the OpenAI and Claude APIs. The OpenAI connection can suggest skin combinations based on match history and generate preview images. The Claude connection can turn a plain English description, like wanting a certain look, into a YAML profile automatically. Windows 10 and 11 are fully supported with native integration. macOS support is limited and needs Rosetta 2, and Linux support is limited and needs Wine 8 or newer. There is no support for Android or iOS beyond a web interface for editing profiles. The interface and documentation are available in eight languages, and the project describes a support system for users including ticketing and live chat. The README does not state a license.