Redcap's Corner Pathfinder
Duergar are humanoids with the dwarf subtype. They have the racial traits found on page 117 of the Bestiary.
FAVOURED CLASS OPTIONS
Instead of receiving an additional skill rank or hit point whenever they gain a level in a favoured class, duergar have the option of choosing from a number of other bonuses, depending upon their favoured class. The following options are available to all duergar who have the listed favoured class, and unless otherwise stated, the bonus applies each time you select the listed favoured class reward.
Cavalier: Add +1/2 to the cavalier’s challenge damage.
Cleric: Add 1/6 to the number of uses per day of the cleric’s channel energy class feature.
Fighter: Reduce the non-proficient penalty for one weapon by 1. When the non-proficient penalty for a weapon becomes 0 because of this ability, the fighter is treated as having the appropriate Exotic Weapon Proficiency (Core Rulebook, pg. 123) feat with that weapon.
Monk: Add 1/4 to the number of uses per day of the duergar’s enlarge person (Core Rulebook, pg. 277) racial spell-like ability.
Rogue: Add 1/4 to the number of uses per day of the duergar’s invisibility (Core Rulebook, pg. 301) racial spell-like ability.