Background: The Wild Magic Sorcerer in my group often uses his at-will power Chaos Bolt. On a hit with an even numbered roll, he gets to make a secondary attack against a creature within 5 squares of the original target. This is a Charisma vs. Will attack that says: "Hit: 1d6 psychic damage..." He is wielding a +3 implement and has the corresponding Weapon Focus feat to add 2 damage to his implement attacks. Additionally, he has Chaos Power as a class feature, which adds his Dex mod plus 2 bonus to the damage rolls of arcane powers.
Question: What, if anything does he get to add to this 1d6 damage roll? Does he just do 1d6 flat damage? Does he add implement damage? Does he add Weapon Focus damage? Does he add Chaos Power damage? Some combination of these?