Diabolic Transformation is a tiefling variant racial daily power. It is obtained by taking the Diabolic Soul feat and replaces infernal wrath.[Dr381:87]
You roar with fury as the hellish blood that flows through your
veins reveals its true power. In the blink of an eye, you transform into a brutish fiend.
Daily ✦ polymorph
Personal
Prerequisite: Diabolic Soul feat
Special: Once during this encounter while you are in this form, you can use the black wrath of hell power.
Effect: You transform into a diabolic brute until the end of the encounter. While you are in this form, you gain regeneration 2, you increase fire resistance by 5, you gain a +2 bonus to damage rolls, and the bonus to attack rolls granted by your Bloodhunt racial trait increases to +2.
11th level: Regeneration 4.