GregTech-Odyssey is a deeply optimized GregTech modpack centered around GregTech, featuring over 350 multi-block structures, engaging gameplay mechanics, and functional bays that boost production capacity. It also incorporates magic mods to enrich the overall gameplay experience. The core mod, GTOCore, not only deeply customizes the game flow but also introduces machine combo mode (automatic switching between machine modes), multi-threading optimization, structural module gameplay, and enhancements to EMI and AE. Through extensive modifications, the modpack achieves faster startup, significantly improved FPS, and maintains excellent smoothness and stability even in large-scale automated and multi-block scenarios.