Boon of the Warmonger

Fiendish Boon (Prerequisite: Requires a deal to be made with a Devil)

Due to your deal with a War Devil, you gain the following benefits:

Attack Power. Once per turn when you deal damage to a creature, you can add an extra 1d6 cold or fire damage to the target.

The extra damage increases to 1d8 when you reach 11th level.

Cold-Iron Coating. When you hit an eladrin, fey or demon with a weapon attack, you can deal an extra 2d8 force damage to the target and until the start your next turn it cannot benefit from any method of teleportation. You can benefit of this feature only once per turn.

Sow Discord. As an action you whisper magical words that antagonize one creature of your choice within 30 feet. The target must make a Wisdom saving throw. On a failed save, the target takes 4d4 psychic damage and must immediately use its reaction to make a melee attack against another creature of your choice that you can see. If the target can’t make this attack (for example, because there is no one within its reach or because its reaction is unavailable), the target instead has disadvantage on the next attack roll it makes before the start of your next turn. On a successful save, the target takes half as much damage only. 

Once you use this action you cannot do so again until you finish a long rest. You use your Intelligence, Wisdom or Charisma modifier when determining the saving throw DC, which you must choose when receiving this boon.