Sanctuary

Humanity was destroyed, Earth qas ravaged so they colonized a far away planet that coukd sustain them named X3N0X15
Or Xenoxis
Named after those who first colonized it
Centuries went by and Humanity thrived again, though when thwy started digging for oil or other resources, they unveiled a vault of somekind, glowing pink, red, purpl, turquoise, etc. Once it was opened (137 years later) deranged Alien mutants emerged, and savagely murdered most ofh the remaining humans, forcing them to go into orbit of Xenoxis, and living on a huge carrier those too juvenile to live on Shix (the carrier) were sent to the wastelands of Xenoxis, to die.
On the carrier there are Liths, ranks of society, The highest lith is The Prior, direct decendents of those who discovered Xenoxis, then there goes
From top to bottom
Tigra
Serpentine
Turkha
And the Lithless