Infernal Connection

You have more deeply connected with your innate infernal power, granted to you by the curse placed upon one far before you. You are granted the following benefits, all of which empower your trait of being able to use Hellish Rebuke.

• If a creature fails their saving throw against Hellish Rebuke, you automatically deal maximum damage (20 damage). You only roll 2d10 if a creature succeeds their saving throw. 
• If Hellish Rebuke kills a creature, you recover 2d8+your charisma modifier hit points. 
• Hellish Rebuke ignores resistance to fire damage. 
• If you have used Hellish Rebuke once but haven't taken a long rest you can continue to use it. However, for every usage beyond the first without having taken a long rest, you suffer two levels of exhaustion.