Arn was born from the unlikely union of an elf hunter and a human woman named Kerstin. Kerstin as a teen had wandered into the forest that the elves had called home. While in the forest she was attacked by Yuan-Ti and was knocked unconscious. Lucky for her a group of elven scouts was passing by and killed the Yuan-Ti. The leader of the group an elf male named Garvon, decided to take the unconscious girl back with them.
The girl was unconscious for a few days, when she had finally awakened she jumpped and tried to run from the healer that was treating her. Garvon being near back came to see what was going on and Kerstin ran into him, looking supirsed at the elf.