Resourceful

You've mastered every play that'll give you an edge when it comes to using common items, and gain the following benefits:

You are proficient with improvised weapons.
You can add your proficiency modifier to the saving throw
DC against for common items used by you.
When taking time to recover reusable items such as ball bearings or caltrops, no roll required.

Additionally, whenever you deal damage with alchemical acid, alchemical fire, caltrops, holy water, or oil, that damage increases by 1d4 at 5th level, and again at 11th and 17th levels.