Many Wolf Priests are skilled in the native Fenrisian healing arts and carry with them potions and balms that quickly reduce the pain and discomfort of an injury. If a Wolf Priest equipped with healing potions and balms joins a unit, you may ignore the first failed saving throw each turn for the unit. The potions will not work on a model that has suffered Instant Death (eg, is hit by a weapon whose Strength is twice the model's Toughness) or that has been hit by a weapon that allows no save. It may not be used if the Wolf Priest is in base contact with an enemy model. The Wolf Priest cannot use the potions and balms on himself.
Errata — Chapter Approved: Codex: Space Wolves clarifications (v1.0): If a Wolf Priest takes Healing Balms and is escorted by a Wolf Guard bodyguard in Terminator armour, the balms do not allow the bodyguard to ignore the first failed save made against the Terminator's 5+ invulnerable save.