About me: Beric Dondarrion is the Lord of Blackhaven and the head of House Dondarrion, a vassal house to House Baratheon of Storm's End. He is a young lord who still enjoys the life of a knight, including taking part in tourneys.
Upon hearing of the atrocities committed by the Mountain, Eddard Stark, acting as the Hand of the King, orders Beric to take a hundred men, ride to Ser Gregor's keep and execute him for treason and murder. Beric willingly agrees to the task.
Beric is rumored to have been killed in the Battle at the Mummer's Ford, and in reality he was by the Mountain, who drives a lance through his chest, though Thoros of Myr unwittingly resurrects Beric. The survivors form the Brotherhood Without Banners.
Dondarrion reunites with Thoros's party at Hollow Hill, the headquarters of the Brotherhood, and is surprised to see they have captured the Hound. Beric reveals he has converted to the religion of the Lord of Light. After Arya accuses the Hound of the murder of Mycah, Beric sentences him to trial by combat as there is no other witness to confirm his guilt, and chooses himself as Clegane's rival.
Using magic, Beric ignites his blade with fire, initially giving him an advantage during the fight due to Sandor's fear of fire. However, Sandor's superior strength eventually proves enough to overpower Beric, and with a powerful downward swipe Sandor cuts deep into Beric's shoulder, nearly cutting off his entire arm and cutting right through his flaming sword. Arya attempts to kill the Hound while he tries to extinguish his shield which had been set a flame during the fight, but she is stopped by Gendry.
Sandor taunts Arya over how the gods prefer him over her friend, but he is interrupted and shocked by Beric, who has been revived and healed by Thoros using the Lord of Light's power. Since Sandor effectively won the fight, Beric declares him innocent and sets him free, but keeps Arya with the Brotherhood, intending to ransom her to her mother and brother at Riverrun. Later, Beric reminisces on the times he has been killed with Thoros and Arya. Arya briefly asks if Thoros can revive a man with no head, clearly referring to her father, but Beric merely compliments Eddard's honorable nature and tells her of the side effect of his resurrection: with each revival, he loses some of his memories and is less himself, a life he would not wish on Eddard.
The group is later encountered by Melisandre, who seeks out Gendry. Melisandre briefly examines Beric and is clearly astonished at how Thoros has been able to revive him so many times. Against Arya's wishes, Beric sells Gendry to Melisandre for gold, a decision that later leads Arya to abandon them. When Beric informs Arya that they will be delaying ransoming her in order to launch an attack on some Lannister soldiers instead, it is the final straw and Arya flees from the group.
