Brainiac deeply pondered about the Gates of Hell that had been shut.
The Gates of Hell was Lord Sherlock's special method of opening the wall at the end of the tunnel. It created a tunnel that looked like mirrors. This name was given by the gamers.
They were unable to travel through the tunnel because the Gates of Hell disappeared soon after Sherlock vanished. The gates had become a huge wall again.
The disappearance of Lord Sherlock was related to the Gates of Hell.
Brainiac examined the statue and chest that opened the Gates of Hell for many days. He was sure there was no more Mana on them. Even the Runes had faded.
But it was hard to say because the statue didn't have Runes or Mana previously. With Sherlock's activation, the statue moved and chiseled through the wall, thus opening the Gates of Hell.
There wasn't much time for Brainiac to ponder. The whistle-blowing gamers had led Andrew and the Winterfell residents here.