Clearly that scene, even in its dreamlike quality owes much to Willard's emerging from the water with a camouflaged face in Apocalypse,another Milius script.
This scene has it all,it's the epitome of all things barbarian:Frazetta pillar,chained nude beauty,an orgy,beastmen,snakes,caverns,oiled up nude bodies,cut up bodies,a panther,fire and smoke,lurid colors and a cauldron.And some truly inspired mythic and sinister and ponderous queues/chorals by Basil.