Exotic Mastery Feat

You have mastered the use of your armor and/or weapons through many adventures, learning their strengths and weaknesses in equal measure. You gain the following benefits:

Prerequisite: 8th level, Proficiency with martial weapons and/or light/medium/heavy armor

• You gain proficiency with four exotic weapons of your choice if you have proficiency with martial weapons. You do not have to choose which exotic weapon you gain proficiency in right when you pick up this feat. If you reach your maximum, you can choose to drop one or more exotic weapon proficiencies in favor of others upon leveling up.
• You can now use armor types that are labeled Exotic if you have the appropriate armor proficiency.

Source: VSS, page 283

These are powerful armor and weapons that only appear if you commission a Master Artisan to craft you one or travel to niche locales. Work with your GM to see where you might acquire this gear or work with a party member that has the Master Craftsman feat.