Elemental Fury (Su)
Source: Pathfinder Unchained, p. 16
A monk who selects this ki power must select one type of energy: acid, cold, electricity, or fire. Once this choice is made, it cannot be changed. The monk can expend 1 point from his ki pool as a swift action to imbue his natural attacks with this energy, causing them to deal 1d6 points of damage of the chosen type for a number of rounds equal to 1/2 his monk level. A monk must be at least 6th level before selecting this ki power.