User:Average/Intelligence

Intelligence the ability to assemble concepts. Related to language.

Things that increase ones intelligence: potions specific to the purpose, otherwise broad study of arcana and experiencing some success.
Things which decrease it: loss of focus on the abstract (like obsessing with small details) can cause permanent damage.

If your intelligence is zero, you have no ability to understand language or form conclusions. Intelligence can increases with age as more knowledge is assimilated/integrated.