1974 cult-film Zardoz . Other sources of inspiration: the wicked city of SoGo from Barbarella ; Xuthal (and other green-stone cities) from Robert E. Howard's Conan . Read more Mutant Human NPCs are humanoid non-player character mutants. Mutant Human (NPCs) Mutant Plant NPCs are mutated non-payer character plants. Mutant Plant (NPCs)