Brisngr: I have finished! Caution: All Spoilers contained here.

• In order of Occurrence
  
• Lethrblaka and the Ra'zac were killed by Roran, Eragon and Saphira in Helgrind
  
• Katrina is pregnant
  
  
• On the day of Roran and Karina's wedding Murtagh and his red dragon Thorn attacked the Varden with 500 soldiers. The Varden succeeded in defeating the 500 soldiers, but they lost many lives, much to their surprise, for the Varden greatly outnumbered the soldiers. The reason why is because the soldiers were impervious to pain, due to a spell that the Empire King Galbitorix cast upon them. A blow that would have usually proven fatal for a normal foot soldier didn't even slow the demented soldiers. Eragon also succeeded in driving off Murtagh and Thorn. Despite the day's events, Katrina and Roran were still married by none other than Eragon.
  
  

• -Eragon was sent to Farthen Dur, a dwarfish city in a hollowed out mountain, without Saphira, to oversee the decision of the new dwarf king. While in the city he was attacked by a group of dwarfish assassins from a certain clan that had become his sworn enemy. Orik, the dwarf Eragon was fond of, saw to it and that the clan was banished from Farthen Dur. Soon after, Orik was elected king of the dwarves. And Saphira quickly flew there for the coronation. Afterwards Eragon and Saphira flew to Ellesmera the elfish capital.
  

• later in the book Roran was sent on a raid and he directly disobeyed the orders of his commander, in which resulted in Roran getting whipped 50 times. (Even though if he didn't disobey the orders the entire command would have been condemned to death.) But he was then healed and put in charge of his own command, thanks to Nasuada, leader of the Varden rebel group. The raid he conducted went exactly as planned. He was also in charge of urgals as well as humans. One of the urgals questioned his authority, and challenged him to a fight, without any weapons. Urgals, in case you don't know are at least 6-7 feet tall, extremely beefy creatures, whose lives revolve around war. Roran was able to single handedly force the urgal into submission.
  

• -In Ellesméra Eragon and Saphira met up with their masters, Oromis the elf and his dragon Glaedr to complete their training. While in Ellesmera, Eragon convinced the elf that swore to never make another dragon riders sword again, to make one for him, though he had to do much of the work himself. He named the blue sword Brisngr, and every time he said the name the sword caught fire.
  

• -Glaedr and Oromis flew to join the elfish army to aid in their efforts, while Eragon and Saphira went to the Varden to aid in the effort to capture a city. Eragon and Saphira were successful, but Glaedr and Oromis on the other hand, weren't. They were slain by Murtagh and Thorn, but Murtagh was controlled by Galbitorix for a majority of the battle. Murtagh killed Oromis with a blow to his torso, while Thorn killed Glaedr with a bite to the head. Glaedr retreated to his heart of hearts, which was in Eragon's possession.