Bunch of shit happens, but basically Dany ends up killing most of the remaining main characters (after they fail at stopping her). Dany kills (has killed) Jon, Sansa, Ayra, Brianne, even Bron. Dany rules as the MAD QUEEN of Westros. She goes even madder. There is a timeskip. She goes even madder. She somehow gets even more Dragons. Westros is pillaged and plundered by Dany and her Essos people.
GOT is basically the story of how people from one continent came and destroy another. They end it with her on the Iron Throne with Dragons and Dragon shit every where, just being mad queen. She feeds the Dragons babies... I shit you not. Then there is a conversation about her ordering people to find any lannister babies and have them killed immediately and some weird allusion to some surviving somewhere. It's a throwback to the mad king. She sits on the iron throne, crazy as all fuck, surrounded by dragons. Fade to Black.
Screen-cap this, you're godamm welcome.