Another reason for an increase of XP can be Prestige. However, it's not the Prestige from the film starring Christian Bale and Hugh Jackman. Instead, it's a technique with OSRS Fire Cape that is designed to stop you from re-doing the same floor repeatedly for gain. The only thing a new Dungeoneer should be aware of is to take every floor at the level of his Dungeoneering before setting it again...