Thorin, however, refuses to say anything, enraging Thranduil. Using the ring, Bilbo enters Thranduil's hall, where he meets Lianna. With her assistance, he is able to free the dwarves by sealing them into barrels which are sent down the river to Lake-town. There, Bilbo becomes friends with Bard (André Sogliuzzo), captain of the town guard, and performs several tasks for him, including finding his Black Arrow, which is said to have special powers. The party head towards the nearby Lonely Mountain. They find the secret entrance, but Bilbo is dismayed to learn the dwarves have no idea how to kill Smaug. As such, he sneaks into Smaug's lair to try to find a weak spot. Bilbo tricks Smaug (James Horan) into showing him his stomach, which is coated in diamonds, except for one small spot, where his skin is exposed. Bilbo leaves, telling the dwarves of Smaug's vulnerability, and is overheard by a nearby thrush, who heads towards Lake-town. Furious that he has been outwitted by Bilbo, Smaug bursts from the mountain and attacks Lake-town. However, the thrush tells Bard of the exposed skin, and Bard fires the Black Arrow into Smaug's chest, killing him. Several days later, Thorin learns that with the demise of Smaug, an army of men and wood-elves are heading towards the Lonely Mountain to claim back their own lost treasures. Determined to keep everything for the dwarves, he sends a raven to his cousin Dáin, asking for support. Meanwhile, he tasks Bilbo with finding the Arkenstone, a treasure of great importance. Bilbo does so, but sneaks out of the mountain with it, and, in an effort to prevent the upcoming battle, gives it to Bard and Thranduil, who are leading the army of men and elves. They offer to return the Arkenstone to Thorin if he gives them their treasures, but he refuses, denouncing Bilbo as a traitor. The next day, Dáin's army arrives, and a battle seems unavoidable. However, before the conflict begins, Gandalf appears, revealing the imminent arrival of an army of goblins and wargs, led by Bolg. Thorin agrees to join with Bard and Thranduil as the Battle of the Five Armies begins. After Gandalf sends Bilbo to Bard's unit, Bilbo meets Lianna, who tells him he must find Beorn (Michael Gough), a "skin changer" currently in the form of a bear, as Beorn is the only one who can defeat Bolg.