The central room is intended to represent the lair of the boss of the Herooquest - The frozen horror expansion. the room is suspended above an underground lake. the whole is made up of stalactites and stalagmites of icy water. you enter the room via a ramp that leads to a portal. you then have to pass through a grid made of ice spikes before arriving in front of the boss (the grid can be manoeuvred using a clever little mechanism). 2 staircases with ramps on the sides and an icy corridor are also available as options, and they go around the central room.