A subject you select is pummeled with
telekinetic force for 1d6 points of force
damage. You can choose to have the power deal an equal amount of
nonlethal damage instead.
Concussion blast always affects a subject within
range that you can see, even if the subject is in melee or has
cover or
concealment (you cannot use this power against creatures with total
cover or total
concealment).
Nonmagical, unattended objects (including
doors,
walls, locks, and so on) may also be damaged by this power.
2. For every 2 additional
power points you spend, this power can affect an additional
target. Any additional
target cannot be more than 15 feet from another
target of the power.