You survive a deadly encounter with a non-humanoid monster. Because of the encounter, you gained insight into the creatures weaknesses. (work with your DM to determine details)
You are magically transported to your current location, a land far away from where you were born. Any family or friends are left far behind, This event makes you a foreigner in the land in which he now dwells. (work with your DM to determine details)
While foraging or hunting for food, you have an encounter with a trapped predatory beast. Instead of slaying it, you free it. The freed beast disappears. Later, you are trapped by a falling log. The same beast reappears, aiding and freeing you.