For as long as Burburtep can remember he has been a slave to someone. Doing all the assigned jobs he was given his strength grew rapidly during his youth. This didn't go by unnoticed by his masters. He was sent to fight in illegal deathmatches for the entertainment of others. He, for his own sake, was always victorious. His hands are stained with so much blood of slaves of same fate he dares not to think about it. All this he did just to survive himself. Occasionally Burburtep ponders what's there to protect, to live for. His masters would collect all the winnings and reward Burburtep with maybe one extra slice of bread. And even that slice would be hard as rock or dry as sand.
One day something unexpected happened. Due to the assassination of Burburtep's master, he was released to the open market. He knew he would soon have a new master and life would remain the same. He heard this new master was a wealthy Pathfinder. Burburtep didn't really know anything about pathfinders, thus didn't think of his new master as anything but a petty thief. Burburtep's surprise was quite big as the supposed new master unchained him right away and told Burburtep he is free. Burburtep had never been free, and didn't know what to do about it. Without guidance he would have felt being lost.
Burburtep learned a bit about the institution his 'master' belonged to. It was something to start with, and with his mighty strength and overall excellent ability to survive even the most gruesome situation he was accepted as a pathfinder.