The Solar Children, worshippers of the sun, who harnessed its power to fuel their technology and built grand temples amidst the deserts.
Their civilization met its demise through a cataclysmic solar flare, far beyond any strength known to modern science, which turned their proud cities and installations into glass.
Over time, these glass relics were buried by the desert sands, now mistaken by many as quirks of nature.
The Greenwardens, pioneers in the field of bioengineering, crafted a symbiotic relationship with the environment, creating living structures and implements from genetically altered flora.
Their cities, designed to be fully biodegradable, eventually melded back into the earth, leaving scarcely a trace behind.
Today, any peculiarities in plant DNA are brushed off as natural variances, not the remnants of advanced genetic manipulation.