When Thrall left the horde to heal the world, Garrosh, son of Grom HellScream became warchief and start an attack to Ashneval. Furion and Tyrande was trying to gather the alliance and re-unite them, but Varian Wrynn, king of Stromwind denied joining Worgen of Gilneas to the alliance.
There is no much history about this clan, but it seems that they were infected by forsaken (Sylvanas) and became wolves. Then they found a way to control their anger and found tranquility, with the help of Furion, they hoped to be able to join alliance.
In the gathering, Velen, the prophet of the draenei was also there and talked with Anduin, son of King Varian and then Anduin decided to leave his father and go with Velen to learn more about holy light.
Velen is my favorite character in this series, one of the oldest creatures who denied sargeras's offer to join his legion and escaped, while his comrades, Archiomand and Kil'jadan accepted.
On the other hand, Jarod Shadowsong, after years of absence, returned to the society of the elves seeking Tyrande's help to cure his wife, but it was late. They understood that they are aging and their immortality is fading.
It was mentioned in this book that his sister, Maiev, managed to hunt Illidan and kill him, but no detail was provided here. Now she was training her watchers for better protection of the elves, but in fact, she was using them as a troop to overcome Malfurion and kill the highborns who wanted to come back to their society, Although she killed several high born and imprisoned Malfurion, she didn't succeed because of Jarod.
King Varian, was suffering from his past, loosing his father in first war with orcs, then poisoned and lost his memory and lived as a gladiator and then regained his memories and returned to his kingdom, all had made him so angry person who easily lost his control. With help of Worgen, he found his tranquility and agreed to fight beside them. He was the wolfheart.
Priestess Tyrande took the position of leader in defending Ashneval, but Garrosh was so smart and his tactics were so successful in disabling Tyrande from doing any magic and was almost defeating her, but suddenly, King Varian with worgens joined the battle and defeated Garrosh. This part was not very pleasant that without any especial tactic, Varian managed to defeat the horde.