Gnomes are Small. Apply the Small adjustments and effects from Combat Scaling, including its ability, attack, AC, maneuver, Stealth, reach, movement, weapon-damage, ration, weight, and space rules.
Intelligent: +2 Racial bonus to Intelligence.
Darkvision: See in darkness out to 60 ft.
Illusion Affinity: +1 Circumstance bonus to the spell DC of Illusion spells the Gnome casts.
Illusion Resistance: +2 Racial bonus on saving throws against Illusion effects.