Henry/Vecna is afraid to enter the cave where Max hides due to the cave's significant connection to his past and powers, revealed in the "The First Shadow" episode. This fear is tied to deep psychological and supernatural reasons linked to Vecna's origin and trauma.
"The cave represents more than a hiding spot; it is the shadow of Vecna's own trauma and losses."
Vecna’s terror of the cave is not just physical but deeply connected to his origins, reflecting a blend of his past experiences and the mystical forces surrounding him. The narrative illustrates how places can hold symbolic power over individuals, particularly those shaped by trauma.
Author’s summary: Vecna's fear of the cave in Stranger Things 5 stems from its deep link to his traumatic past and supernatural power, making it a psychological and mystical battleground.