Malus

Silverlaine Thorne (better known as Malus) was the younger brother of Greydon Thorne.

Biography
Approximately two years after the Second War, the two Thorne brothers arrived to Gadgetzan in Tanaris and visited a newly-opened bookstore owned by the goblin Charnas. Greydon and Charnas began conversing, but Silverlaine wasn't interested in that, so he left them alone.

The two brothers were members of the Order of the Seven Suns before Silverlaine betrayed the order and his brother. Wanting to own the Diamond Blade, given to Greydon by a naaru, and to prove his worth, he stole the blade and went to fight Xaraax, the order's main enemy. Instead, Xaraax convinced him to join him. When Silverlaine returned, he killed the naaru, shattering the blade and sending its shards across Azeroth.

Traveler
Malus and the Hidden worked with the Shattered Hand clan to locate Captain Greydon Thorne and his compass with whom he already had a certain history. As the Hidden were leaving, he noticed the ogre warrior Throgg and asked him to come with him. The ogre refused, so the human approached Garamok, a Shattered Hand orc and asked him about the ogre and the orc stated that they want him for carrying supplies as the ogre can't be a true Shattered Hand. Malus then offered 30 silvers to Garamok and he released Throgg from his oath. The ogre then swore loyalty to his new brother, Malus and the Hidden.

Some time after the Cataclysm, Malus and his companions with the help of the traitor Jonas Cobb attacked Greydon's ship the Wavestrider on the Veiled Sea and slaughtered most of the crew, the only survivors being the second mate Makasa Flintwill and the cabin boy Aramar Thorne, Greydon's son and new keeper of the compass.

Landing in Feralas, the Hidden tracked Aram and Makasa throughout the forest, almost getting them and the compass when they caught the boy's new friend, the murloc Murky, whom the Hidden wanted to trade for the compass. Aram, however, was captured by the ogres of the Gordunni clan and brought to Dire Maul.

Having learned of this, the Hidden entered Dire Maul and Malus challenged King Gordok to a mak'gora fight. The King refused saying that the opponent is no ogre, so Throgg challenged Gordok, and Malus offered to fight in Throgg's stead as his champion. The two entered the pit where Aram was previously fighting, but after a difficult fight, Malus took hold of the ogre's morningstar and ended the King's life. He then fought against king's former guard and even rushed to get to Aram but was held and knocked out by the wyvern One-Eye. Aram and his companions escaped. As Malus saw them taking off, he shouted to stop them and Zathra responded by firing two bolts which hit the druid Thalyss Greyoak.

He was then challenged by another, a single-eyed ogre named Kor'lok who acknowledged him as the new King Gordok. Malus thus accepted the challenge but chose Throgg to fight as his champion, and the one-handed ogre immediately killed the one-eyed ogre. Malus ordered his new ogres to leave Dire Maul and find the boy and the compass.

The Spiral Path
Aramar coincidentally met Charnas who revealed him the existence of Silverlaine. The goblin told him that Greydon had been very proud of his brother, but that he only met Silverlaine once, so he wasn't sure what happened to him. Charnas knew that Greydon didn't mention him much, but when Charnas did ask about Silverlaine, Captain Thorne said that they hadn't seen each other recently.

While Charnas and Aram's group were traveling to Stonetalon Mountains, Charnas told Aram that on his last visit, Greydon told him that Silverlaine was somewhere in northern Kalimdor.

Identity
Before the revelation of Silverlaine's identity, there are several hints throughout the books that Malus could be someone else:
 * When Malus entered Gadgetzan, Marin Noggenfogger wondered if he had met him under a different name.
 * Charnak says that the two Thornes entered his shop, almost twenty years ago.
 * When Aram encountered the first vision of Malus in his dreams, he resembled Greydon.
 * Greydon knew Malus and called him a traitorous dog.