Orc Heritage.

The orcs were a strong militaristic tribe. They never had a unifying nation instead spread around just as much as the oxygen in the air. One day the tribes had gotten together and formed a nation. Through their militaristic prowess system and prowess, the other kingdoms became fearful and spiteful. 
The human and elven kingdom sent "messengers" to bring "gifts" to the orcish people. Leading to the mass death of nearly 250 casualties. Using this the human and elven kingdoms declared war on the orcs. In the end, the orcs militaristic and battle-hardened nature caused them to nearly make the two kingdoms become endangered before killing the orcs through unknown means to the citizens. The king of the human kingdom and the queen of the elves had called upon Zerstörung to help their soldiers gain favorable odds in battle. Concluding the war, wiping the orc's history and civilization to the winds of time.
200 years later the orcs are now put into slavery and not allowed past the age of 16. Humans believe that is when their tenacity shows. When Orc "fangs" have shown. This not only keeps their population culled but also keeps demoralizing the orcs knowing their end will be soon. 


The PC can find out this horrible secret and work to right the wrong done and free orcs. or ignore it and allow the orcs to be cattle for the rest of their days.