Tremendously Hulking

The incredible fury that boils within you can come forth with terrifying effect, rage making your body literally grow in size and stature.

When you enter a rage, you can spend 4 exertion points to increase your size category by one step (from Small to Medium, or from Medium to Large) for the duration of your rage. While your size is increased, your Speed increases by 10 feet, your weapon attacks deal an extra 1d4 damage, your maneuver DC increases by 2, and your reach increases by 5 feet.