The experiments of a brilliant mind can lead to terrible transormations of the Jekyll & Hyde/Banner & Hulk variety. For those of such powerful intellect or personality, rage can be both a blessing and a curse. Forged from madness, strength of mind replaces strength of muscle through rage, creating an uncontrollable beast out of what might otherwise be a meek scientist, artist or philosopher.

Level 3: Specialist

When you choose this subclass at 3rd level, select either intelligence, wisdom, or charisma to be your speciality.

You gain proficiency in two skills of your choice that use your speciality modifier.

Level 3: Maddening Rage

When you enter a rage, you use your speciality modifier in place of strength for any d20 roll but you must replace your speciality with strength in the same way.

Level 6: Hostile Takeover

At 6th level, your rage strengthens its grip on your true self. When you are raging, your size increases by one size and your carrying capacity doubles.

In addition, while you are raging and not wearing armor, you can add your speciality modifier to your armor class.

Level 10: Ego Bleed

At 10th level, your personalities begin to merge. You gain proficiency in saving throws that use your speciality modifier.

In addition, choose one skill in which you have proficiency. You gain expertise with that skill, which means your proficiency bonus is doubled for any ability check you make with it. The skill you choose must be one that isn't already benefiting from a feature, such as Expertise, that doubles your proficiency bonus.

Level 14: Brains and Brawn

You have found a way for your two sides to cohabit your body. All features from this subclass become passive traits, losing their rage requirement if they have one, and your speciality modifier is no longer required to be replaced with your strength.