I'm currently overseas for the next two months, backpacking through Brazil, and won't be able to watch the episode so decided to come in here to find out what happened.
I understand Oberon died, but how?
Anything else important?
Oberyn kicked The Mountain's arse by playing a lot of Dark Souls and learning how to use invincibility frames of flips/rolls to avoid the latter's slow, telegraphed attacks. Stuck him with a spear a few times and had him down for the count. Then got all "I have to use my taunt before checking if he's actually dead" and The Mountain took advantage of his ego overruling sensible, tactical fighting, took out his feet, grabbed his head while lunging over him, and said "YES I RAPED YOUR SISTER THEN I CRUSHED HER HEAD LIKE THIS" and made a Oberyn brain milkshake.
Sansa defended Littlefinger by dropping truth bombs mixed with lies to sell the idea that her aunt had committed suicide, and now seems to have turned into a Sith Apprentice in cahoots with Littlefinger.
Grey Worm saw Milisawhateverthefuckhernameis' boobs and apologised but she dug it cos he's a total babe.
Dany found out Jorah betrayed her all those years ago and threw a tantrum, ignoring all the work he's done for her since, and threw him out on his arse. Jorah confessed his love so he's heartbroken but at least he doesn't have to deal with her shit any more.
Theon now Reek pretending to be Theon managed to take some Ironborn settlement at the request of Ramsey with the promise of letting them go free. And in a predictable Bolton twist they all got flayed for fun. Ramsey is now officially a Bolton because daddy is proud.
The wildlings killed a bunch of people because they're dumb fucks but let the chick from Skins and her baby go because empathy.
John and everyone else at the wall are shitting themselves.
Tyrion and Jamie bonded over bugs.