**Spoilers ahead for “Black Panther: Wakanda Forever.” You’ve been warned.** In a long, epic film about grief and loss, one of the most emotional moments in “Black Panther: Wakanda Forever” comes at the very end. In the mid-credits scene, it is revealed that T’Challa (Chadwick Boseman) and Nakia (Lupita Nyong’o) actually had a kid off-screen, and he’s been living with Nakia in Haiti, away from Wakanda and his place in the kingdom.