Duergar Starting Stats are:
Dex: 14 Str: 14 Wis: 10 Int: 12 Con: 15
Duergar excel at fighting, covert & occult and have an ok bonus in mental and are bad at magic and faith (the latter makes no sense thematically)
They've got a +6 to Blunt Weapons, Ranged Projectile Weapons, Fighting.Offensive.Special,
They also excel at Covert.Hiding & Stealth
Occult.Methods.Chanting & Spells.Cursing & Summoning