Stomach of Steel
From A KoL Wiki
Your stomach is fortified with vitamins and minerals. Er, it's fortified with the ability to contain more things. Those things may or may not contain vitamins and minerals.
This skill is obtained as a reward for completing the Deep Fat Friar's Gate Quest as a Teetotaller. It raises the maximum Fullness from 15 to 20.
Unfortunately, the raised fullness doesn't do anything for you if you eat from Chez Snootee.
