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Build factories that will get you through technological ages.
Build new elements of your base that will both complement it visually and add to practicality.
Building huge hellish lava pumps and pipelines in hell are just two out of the many things you're capable of doing.
New metals and other, more miscellaneous materials that should have their place in your world.

Tech Horizon is an old Minecraft styled simple tech mod aimed to provide a similar experience to classic mods like IndustrialCraft 2 and GregTech.