The mod is just as the name states, an Over Cave. The mod replaces the overworld with a dimension just like the deep dark. This mod was made as per request from GeoRCCraft for his modpack on the ATLauncher, Caved IN
The world will generate ores and spawn mods. It will be constantly dark as there is no access to the sky.
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~note this is completely optional you are not obligated to do this.