Pay 4 Force Choose an arena. Until end of turn, for each damage counter put on a unit in that arena by an attack or effect other than Painful Reckoning, put 1 extra damage counter on it.
If another effect in play at the time Painful Reckoning is played doubles all damage, then the damage counters placed are quadrupled from the original damage.
The extra damage counter has no source, even if it is placed as a result of damage done by a unit. For example, let's say an attacking unit does 4 damage. If Painful Reckoning is in play, 8 damage counters will be placed on the defending unit. However, the attacking unit is considered to have done 4 of the damage. This distinction is important when resolving effects such as Boba Fett (G)'s force drain ability or determining damage caused by the Countermeasures effect.