Final answer:
Edgar, estranged from his foster father, chooses to leave for an unknown country to find a place where he can make his true power felt and establish his identity.
Step-by-step explanation:
When Edgar and his foster father become estranged, Edgar decides to leave his home for an unknown country. In the narrative provided, it is made clear that Edgar's relationship with his father is strained, leading to him being unable to see his mother and fearing his father. Despite these challenges, Edgar is determined to go to a place where his abilities can be acknowledged and where he can make his true power felt, which ultimately leads to his decision to journey to an unknown land.
The context of Edgar's departure appears to stem from familial discord and a desire for self-fulfillment. This emphasizes the themes of estrangement and the quest for identity, which are common in literature exploring the complexities of family dynamics and personal growth.