You can manipulate an existing source of energy or an ally's ability to deal energy damage (cold, fire, electricity, or sonic). Once you have manifested this power, you can trigger the power's effect as an immediate action at any point during its duration. When the power's effect is triggered, you can partially suppress or enhance the energy ability of a creature within range that exhibits any magical or psionic variable damaging energy effect (such as a fireball spell, an energy missile power, or a red dragon's breath weapon) by 5 dice.
For example, you manifest energy manipulation, and then an ally psion manifests energy burst. That power normally deals 5d6 points of damage, but you enhance the power so that it deals 10d6 points of damage of the chosen energy type.
Alternatively, if a young adult red dragon used its breath weapon during the duration of your energy manipulation, you could trigger its effect to suppress the damage. The dragon's breath weapon would deal 5d10 points of fire damage instead of 10d10 points (provided you were able to overcome the dragon's spell resistance).
Either way, the power's duration ends once you trigger the effect.
If you spend 6 additional power points, you can manifest and trigger this ability as an immediate action instead of as a standard action (thus eliminating the need to manifest the power and use it within the following round.