Nerve Cluster

The Nerve Cluster is an area inside Bowser in Mario & Luigi: Bowser's Inside Story. This area is accessible for Mario and Luigi when Bowser finishes eating Wiggler's giant carrot, and defeating it. Mario and Luigi come in here to find a pain in Bowser caused by Durmite and her Biffidus helpers. Once Mario and Luigi defeat Durmite and the Biffidus, they enter another room with more Biffidus, and find Toadbert.