The rare rubber sarcophagus mimic feeds by waiting in old tombs and temples, staying very still until a human walks past and does not notice its peculiar shine and rubbery appearance.
Once their backs are turned, it opens its maw and drags them inside with a wet rubber tongue. Once it has a human trapped inside, it feeds off of them over a process of months or years, sustaining itself by digesting their individuality and personality, and excreting rubber and bandages, which is spreads over the human. During this time, the human is in a state of overwhelming sexual pleasure and mindlessness.
Once the human has no individuality left, they are spat out as dumb, obedient rubber jackals, who want nothing except to be played with.