Specialty Skills - This is a type of skill where you can purchase the base skill, and when purchasing it, you pick a specific Specialty. This is known as the Core Specialty. You get to use the full skill bonus with the Core Specialty, and may use the skill bonus with a -5 modifier for all other Specialties under the same skill. This -5 modifier can never reduce a skill bonus for a skill below a value of zero.
You can learn other Specialties as you progress. Each new Specialty picked up will have to be learned multiple times, with each time reducing the penalty by 1 point. The cost for learning the Specialty is the same as learning the skill. Your ranks in a given non-Core Specialty can never exceed 5 and they are only used to offset the penalty.