Make it solely Charisma dependant as a caster. Ranged healing at 3rd level, say 30 feet and 5 feet for every level of Healer. Cast healing spells as a move action at 13th level. And instead of a ray ability howzabout this at 5th level
Destructive Healing: You may cast Cure spells at the undead to deal damage. Treat these spells as Empowered at 5th level, Empowered and Maximized at 10th level, Empowered, Maximized and Enervated at 15th level and Empowered, Maximized, Enervated, and the damage for each hit dice is upped 1 level at level 20. So Cure Critical Wounds in the hand of a healer would do 48+20+50 percent roll of 8d6+Charisma Modifier X 2.5 at a range of 130 feet. That is some serious whupass against the undead. Mass Cure Critical Wounds with a Charisma of 30 would deal 230 damage on average, 115 if saved. Booyah.
Destructive Healing: You may cast Cure spells at the undead to deal damage. Treat these spells as Empowered at 5th level, Empowered and Maximized at 10th level, Empowered, Maximized and Enervated at 15th level and Empowered, Maximized, Enervated, and the damage for each hit dice is upped 1 level at level 20. So Cure Critical Wounds in the hand of a healer would do 48+20+50 percent roll of 8d6+Charisma Modifier X 2.5 at a range of 130 feet. That is some serious whupass against the undead. Mass Cure Critical Wounds with a Charisma of 30 would deal 230 damage on average, 115 if saved. Booyah.