Soul Siphon (Su)
Source: Advanced Player's Guide, p. 46
As a ranged touch attack, you can unleash a ray that causes a target to gain one negative level. The ray has a range of 30 feet. This negative level lasts for a number of minutes equal to your Charisma modifier. Whenever this ability gives a target a negative level, you heal a number of hit points equal to your oracle level. You can use this ability once per day, plus one additional time at 11th level and every four levels thereafter. You must be at least 7th level to select this revelation.