Gardens of Glass is a skyblock mod addon for Botania the main mod. While it can fuction perfectly in a world that is normal in generation it is meant for worlds that are generated as voids. Where you can experience of thrill of never exploring again, where your mind like a good book being read is your only limitation.
In Gardens of Glass (GOG), you must create matter by right-clicking dirt to get pebbles that you can then craft into cobble. The mod is typically combined with other mods to give you a different way to achieve an end goal. However, it is complete and those other mods are not needed.
A much older pack that I have created that uses GOG is Gog Tech at www.curseforge.com/minecraft/modpacks/gog-tech.
A recent creation by migmag789 at www.curseforge.com/minecraft/modpacks/beyond-the-skies starts you in Botania Gardens of Glass and your goal is to make it to the stars.
Download the mod today for your Forge pack to experience it. www.curseforge.com/minecraft/mc-mods/botania-garden-of-glass