What is "Penta-Plunder?"

Penta plunder is a new option in pickpocketing- brought with the May 2015 update- that allows players to plunder 5 consecutive times for the same shard. The number of times the pickpocket is attempted depends on when in the turns the shard is actually stolen and how much fortitude the player has remaining. Unlike auto-loot, you can use penta plunder if you have less than 25 Fortitude Points remaining. The plunder is only attempted as many times as you have points left.