I Found It!

Soon enough, everyone could see something shimmering in silver lights, sending off rays from the ground. Seeing the early signs of these rays made everyone know what William guessed was true, and that pumped up their wills, and made them dig faster and work harder.

William thought deeply about the options of places that the gate could be at. He knew the masters looked for a long time for it, and yet they failed to sniff a thing about it. That meant it was somewhere they didn't get to, and it had to be close by and accessible by the statues here.

It went without saying that the wolf statue knew how to get access to this gate quickly. And that made William guess it was buried underneath the ground, the only place they didn't look at.

The rays kept increasing in number, but they felt like they were too far away. William watched others work for hours, and all they progressed aside from digging deeper, was more rays shining, nothing else.