Source: http://kungfupanda.wikia.com/wiki/Shen

Lord Shen is the main antagonist in Kung Fu Panda 2. He was the son of the royal Peacock family and the heir to the Gongmen City throne.

In his youth, Shen was obsessed with using the powder of fireworks to create weapons. When he overheard the Soothsayer (his childhood nanny) foretelling to his concerned parents that he was to be stopped by a warrior of black and white, he led his wolves on a raid to annihilate all pandas. But upon his return, his parents banished him from the city forever. Shen plotted his revenge for many years, eventually creating an unstoppable weapon, a cannon. Although his weapon and army had brought him temporarily to power in Gongmen City, the Soothsayer's fortune did indeed come true when he was defeated by Po, the foretold warrior of black and white.