The Oakle's Navel Cave Crystal

"" is a TotK: in.

Overview
Inside TotK:, TotK: will find a crystal propped up on a pedestal. When he attempts to pick it up, a TotK: will speak to him, offering a TotK: if he can bring the crystal to the end of its beam. Following this, the wall behind the crystal will part, revealing a large cavern with NaN Boulders rolling across it, and "TotK:" will begin.

After exiting the cavern, TotK: will be in a tight corridor, where a large TotK: rolls towards him. After avoiding the TotK:, he will be able to arrive at the location of TotK:. The TotK: honors its promise. The crystal will then float above the TotK:'s exterior, growing and revealing itself to be the TotK:'s entrance. Once its green coating fades away, TotK: is able to enter TotK:.