Scavenger

You become a master of improvised weapons, and can use them hit hit fast, and hard.

Improvised weapon master

You gain proficiency and expertise in improvised weapons. Additionally you may add your wisdom modifier in addition to any other modifiers for attack and damage with improvised weapons.

Grappler

If your improvised weapon has reach, when you hit an attack with an improvise weapon you may spend your bonus action to grapple the hit target, while the enemy is grappled at the begging of each of their turns they take 1d8 +3 per turns they have been grappled. (For instance an enemy that has been grappled for 5 turns would take 1d8 +15 at the beginning of their 6th turn).

Favored hatred

If you are using an improvised weapon against your favored enemy and you hit an attack, the hit counts as a critical hit.

Flurry of Crits

When you hit a critical with an improvised weapon you may make an attack with an improvised weapon as a free action.