There are several ways to get Experience Bonuses in Everquest. The simplest and fastest ones are pay to win potions from the in-game store. There are some in-game options as well.
Potions usually won’t work on reward claims from tasks/missions, but may in some scenarios. Regular XP and AA XP sometimes can work differently on rewards when using potions as well. Generally, don’t expect to get extra experience from a potion or in-game experience mod item when claiming a reward that grants experience.
Server XP bonuses on the other hand work more often when claiming task/mission rewards, but may not always. Server XP bonuses also stack with other XP modifiers such as potions and Lesson of the Devoted when killing mobs.
DBC = Daybreak Cash. Prices can go on sale at Daybreak’s discretion.