"1[W] + Charisma modifier damage. Until the start of your next turn, when the target deals damage with an attack, it takes extra damage equal to your Constitution modifier on the next attack that hits it before the end of your next turn."
Hit: "2[W] + Charisma modifier damage. If the target hits with an attack before the start of your next turn, it takes extra damage equal to your Constitution modifier from each attack that hits it before the end of your next turn."
Hit: "As above, and until the start of your next turn, if the target saves on its turn, one ally within 5 squares of you can make a saving throw with a power bonus equal to your Constitution modifier."