First conversion, the wrestler:
Wrestling
When you choose this path at 3rd level, you start to master the art of grappling. You may use 1 point of your ki to re-roll an opposed check determing if you grapple an opponent, or if you are grappled by an opponent. Only one die can be re-rolled if you have advantage or disadvantage.
Larger than the Life
Starting at 6th level, the wrestler is considered one size large for pruposes of grappling.
Against the Wall
When the wrestler reaches 11th level, he has a reserve of strength for when the battle is against him. When the wrestler is redued to less than 25% of his hit points, his strength and constitution both increase by 4 points. This lasts until the wrestler is knocked unconscious, gets above 25% of his hit point maximum, or until the encounter ends.
The wrestler cannot use this ability again until after he has completed a short rest.
Finishing Hold
At 17th level, the wrestler has mastered a finishing hold. After maintaining a grapple on a target for 3 rounds, the wrestler forces the target to make a DC20 Consitution save. Failure on the save means the target falls unconscious. In each round after the 3rd that the wrestler maintains the grapple, the target must make another save with a DC two higher than the previous round. Undead and constructs are immune to this.