Alter Aeon Online Help

Keywords are:  'doubleexp doublecap bonus experience'

Occasionally you may see periods of bonus experience.  During these times,
killing mobs may be worth more experience than they are normally. There
are 3 modes: double cap, double experience for random mob types and double
experience for all mobs, the first 2 of which maybe triggered by players
using the 'credit buy doubleexp' option.

For the 2nd mode, the various random mobs types are:

 - Animals
 - Ogres, Trolls and giants (includes mobs 9 feet and over)
 - Demons and evil aligned mobs,
 - Angels and good aligned mobs
 - Fairies and Small creatures (Mobs 3 feet and under)
 - Dragons and Reptiles
 - Undead, Vampires, Skeletons and Ethereal
 - Extraplanar mobs.

There is also a mode for double crafting experience, where you gain double
experience from using crafting skills.

You can see if a double experience event is active with 'event show' or
'news experience'.
Note: Bonus experience does not apply to players below level 13.