http://dragonnest.nexon.net/news/news/00E3N/empowerment-system-update
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Dragon Nest is constantly evolving, and an important change to the PWR system is coming with the next update. PWR will be more important than ever, as it will affect your drop rate. For Players Lv. 1 to Lv. 39, PWR consumption will be reduced by 90%, making PWR last much longer. For Lv. 40 players, PWR consumption will not change. For all players, having 0 PWR left will reduce the item drop rate to 20%. If you’re playing in a party, the average drop rate for all party members will be used.