Horizons III is the sequel to the original Horizons and Horizons: Daybreaker, but updated and remastered for 1.12.2. The Horizons series is created to showcase some lesser-known mods in the Minecraft world that don’t often get put into larger FTB packs. It aims to show off new mods to the realm of FTB, such as Astral Sorcery, Cyclic, EvilCraft, Integrated Dynamics, Silent Gems and The Lost Cities, just to name a few. Other commonly used mods are added in to fill content gaps where needed to better round out the player experience. The mods are left as default as possible to match resources and information found online to help you along the way.
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— FTB Horizons III's CurseForge page
FTB Horizons III is a Feed The Beast and CurseForge modpack created by the FTB Team. It is a general, large-sized "kitchen-sink" modpack. Similar to its predecessors, Horizons and FTB Horizons: Daybreaker, it features several mods not previously included in FTB.