You once said Gregor is perma-angry. What do you think is the source of his anger?
Besides being a sadist and psychopath? Well, from Cersei II of AFFC: “Ser Gregor is overly accustomed to the poppy, I fear. His squire tells me that he is plagued by blinding headaches and oft quaffs the milk of the poppy as lesser men quaff ale.”
It’s possible that these headaches are a symptom of Gregor’s gigantism, but I know plenty of people who have persistent migraines who don’t wantonly murder people.
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