Vecna is taking kids in Stranger Things because he sees them as mentally weaker, easier to “break,” and therefore perfect vessels to power and reshape the world the way he wants it.

In‑story reason

  • Season 5 explains that Vecna targets children because their minds are easier to manipulate, mold, and control than adults.
  • He talks about them not deserving a place in the current world, but deserving a place in his new one, which he plans to build using them as extensions of his will.

The “vessels” idea

  • Episode coverage and breakdowns note that Vecna explicitly calls the kids “vessels,” meaning living conduits for his power and for the energies needed to reshape reality.
  • By turning them into vessels, he effectively builds a psychic network or army he can command, rather than just killing people outright.

Why he needs multiple kids

  • Season 5 discussion highlights that Vecna is working with a specific number of children (twelve) and placing them as “anchor points” to help merge dimensions and potentially reset or reshape reality.
  • These kids function like nodes in a dark ritual or living power grid, amplifying his reach across Hawkins and the boundary between the normal world, the Upside Down, and the Abyss.

How this fits Vecna’s personality

  • Vecna has a long‑running obsession with patterns, time, and cycles, which ties into his use of a fixed number of children and his clock imagery from earlier seasons.
  • Rather than simple destruction, he wants total control—using the kidnapped kids lets him rewrite the rules of the world while proving his superiority over those he considers weak.

Information gathered from public forums or data available on the internet and portrayed here.