The Sculptor was banished for his unorthodox techniques.
Note: This is a rough idea. I hope it helps in deciding where you want to take your ideas. Also I am using Kseh's line as a prompt.
The sculptor was banished for his unorthodox techniques. The strange race created by the the sculptor are not in the image of his race because they banished him for his beliefs/techniques. Who would want friends that look similar to those that banished you? The sculptor created the statues because he went crazy without any social interaction. The Brim became his way to socialize even if they couldn't talk. One day a dragon is passing through and he notices a crazy sculptor. The dragon decided that he will screw around with the sculptor for his own enjoyment. The dragon breathes life into the the statues. The sculptor is confused and what not. The dragon feels bad and tells the sculptor what he did to the statues. The sculptor and dragon become friends. Although the Brim were brought to life as a prank, the sculptor and dragon decided to keep them alive. the Brim are a new race, they are primitive and are learning new things with each day. The Brim see the volcano as a god that speaks to them. the volcano is not a god, it is merely going to erupt. The noises that it makes before an eruption is how it speaks to the Brim and the Brim will translate it however they wish to. Meanwhile, a rumor is spreading throughout the people that banished the sculptor. The people believe that the sculptor is creating an army with the help of an evil dragon to wipe them out. the people begin to attack the Brim which tosses the two sides into a war.