XP is a another currency used to level up the players avatar up as well as placing points for specific skills. 100XP can level up a low-ranking player once this happens You'll Hear Trumpets and the Skills Menu pops up letting you add your points to some of your skills. Earning XP in Custom Adventures is Based on how the creator of the custom adventure decides the amount of XP for Certain Quests, As for Multiplayer it's Rarely gained unless the player has done most of the killing or leveling up takes time so Patience is essential.