Need to boost your experience beyond that of our regular XP Booster? Go for the gold with a box of Booster Gold's XP-Plus Bosster and get a plus-sized experience boost of 50% for 1 hour. Please note, this is a one-time only item and is not tradeable. The XP Boost effect does not stack.
The XP-Plus Booster Box is a consumable item which can be used to temporarily increase the amount of XP points collected.
It is not available in-game, but exclusively from the marketplace as DLC and named XP-Plus Booster Box Two-Pack.