Hot Zones

Hot Zones are typically older expansion zones which have increased experience gains (they get changed typically once or twice a year, sometimes longer).

Franklin Teek (Plane of Knowledge -- near the Guild Lobby entrance) offers a daily kill task (about 18 hour task reuse timer) for each of the hot zones. You can however do more than one at a time if you request them before completing another. These award a pretty good amount of regular or alternate ability experience (at level 100 I still get 6 AA each from the level 90 tasks, and 3 from the level 85 task). Not only that, but they will give your mercenary a decent amount of AA experience if they are not suspended when you make the final kill.

Also, Skal Nethus (Plane of Knowledge -- near Franklin Teek) offers a task called "Udumbara, the flower of legend" that involves every hot zone and results in the augmentation Udumbara. In addition, random creatures in each of these zones now has a chance to drop a unique new augment appropriate to the level of the zone. (There are also the unique augments that drop in the older hot zones still.)

In April 2016 a patch changed the hotzone system, to rotate between 3 sets of zones. According to the April 20, 2016 patch notes:

"Hot Zones now randomly rotate between three possible zones for each level range and are currently set to rotate every 3 months first of January, April, July, and October. Talk to Franklin Teek in the Plane of Knowledge to find your Hot Zone and earn bonus loot and experience!"

Current hotzone list