Channel (Su)
Source: Advanced Class Guide, p. 42
The shaman can channel positive energy like a cleric, using her shaman level as her effective cleric level when determining the amount of damage healed (or dealt to undead) and the DC. The shaman can use this ability a number of times per day equal to 1 + her Charisma modifier.
Greater Spirit Ability: A shaman who chooses the life spirit as her spirit or wandering spirit gains the following ability upon having access to the greater version of that spirit.