2. Tywin Lannister was an even bigger bastard than we thought.

Before he became the not-so-proud patriarch of the dysfunctional Lannister clan, the future Lord Tywin was a fed-up heir trying to clean up his weak father’s messes. As you might expect from the future architect of the Red Wedding, this mostly involved killing a lot of people. The most famous incident involved Tywin’s slaughter of every last man, woman, and child from House Reyne, who’d risen in rebellion against their Lannister overlords. In both the books and the show, Tywin’s revenge was immortalized in the song “The Rains of Castamere”; the HBO series has featured versions by both the National and Sigur Ros, and when the band at the Red Wedding started playing it, that was the tip-off that the shit was about to hit the fan.

But we’d never learned the specifics of the massacre until now, and they’re somehow even more cold-blooded than the song made it sound. Castamere, the Reynes’ castle, was a mostly subterranean stronghold, extending deep underground into the old gold and silver mines through which the house had made its fortune. When Tywin attacked, the Reynes and their followers retreated underground, thinking the complex below was impervious to assault. It was — but it wasn’t waterproof. Tywin had his men redirect a river into the few remaining cracks and crevices. Tywin’s rain washed the Reynes right out of existence.