The Hypnobrai tomb's Slither Pit.

The Hypnobrai tomb is one of the five tombs in which the Serpentine were entombed underground. The Hypnobrai tomb was a series of ice caves. In "Rise of the Snakes", the first episode of Ninjago: Masters of Spinjitzu, the Hypnobrai are released from the tomb by Lloyd Garmadon.

The Hypnobrai mainly used their tomb for "Slither Pit" battles. The Hypnobrai still continue to use the tomb as their home after Skales overthrows Slithraa and banishes Lloyd.