D&Dtools1

Benefit

Once per day, you can reroll any one Heal check. The decision to reroll must be made before learning the outcome of the original roll, and you must accept the result of the second roll.

In addition, if you have the lesser Mark of Healing, on a successful attack with a melee weapon against any foe, you can spend 1 action point to heal yourself or an ally adjacent to you for 1d8+1 points of damage, in addition to dealing normal damage to your foe. If you have a greater Mark of Healing or a Siberys Mark of Healing, the amount of damage you heal is 2d8+3 points.