Azog was the leader of the Orcs who took over Moria after it had been abandoned by the Dwarves. According to the books, Azog slew Thror when Thror tried to seek his fortunes in Moria, sparking the war between the Dwarves and the Orcs. The War ended at the Battle of Azanulbizar where Azog slew Nain, Dain's father. In turn, Dain slew Azog; thus winning the battle and ending the War. According to the movies, Thror led an army of Dwarves to reclaim Moria from the Orcs, Thror was slain and Azog's arm was cut off. Later Azog came back and hunted Thorin and Co. on their Quest. Azog has not yet been killed in the movies.
I must say the arm was the trickiest part of this character. I was looking for good pictures of him and saw some LEGO versions where people had cut one of those robot hands and super glued it on. I wanted to be able to take him apart if/when LEGO makes their own version so I cut the robot hand down to size and stuck it in his arm. I think it turned out pretty good.
Nice job! I really like the hand. I might use that technique for my azog! The torso and legs are really good too, and i like the use of the goblin headpiece. I think the face could use a little work on the eyes and mouth, but still all in all its pretty awesome! Good job!