Stranger Things has delivered plenty of eerie moments over its seasons, but few characters have terrified both fans and cast members alike more than Vecna. Millie Bobby Brown, who plays Eleven, recently shared how deeply Jamie Campbell Bower's performance as the nightmarish character affected her on set.

Ever since Netflix’s megahit Stranger Things graced our screens and we collectively saw Eleven for the first time, we knew she wasn't one to mess with. That's in great part because Millie Bobby Brown,

Try saying this five times quicklyMillie Bobby Brown, famous actor best known for her starring role in Stranger Things,

Modine raved about his 'Stranger Things' costar Millie Bobby Brown being "so focused, so determined, so intelligent"

During an appearance at the Stranger Things Epic Con panel on Oct. 20 in Jackson, Georgia, the 20-year-old actress responded to a fan’s question about her favorite scenes with Bower, joking, “None of them. He terrifies me when he is Vecner. I am terrified of his costume. It scares me.”

The work of makeup was also pretty much in the hands of the makeup team, and hence much was done to transform Bower. Designing every detail in Vecna, they made him a nightmare figure whom fans fear more than anything else.