rms is clear on the skills that it enhance the healing power
Increases effectiveness of your Heal, Sanctuary and Potion Pitcher by 30%.
Increases SP taken by all skills by 15%.
script says the same
{ bonus2 bSkillAtk,"AL_HEAL",30; bonus2 bSkillHeal,"AL_HEAL",30; bonus2 bSkillAtk,"PR_SANCTUARY",30; bonus2 bSkillHeal,"PR_SANCTUARY",30; bonus2 bSkillHeal,"AM_POTIONPITCHER",30; bonus bUseSPrate,15; },{},{}