|From "grand update" thread:|
Team experience allocation. Players of combat level 9 and above who host team group battle challenges are able to choose in which way the experience and faction skill points will be distributed.
The new option check box is available for "Evenly" and "Random" group battle types, if the bottom combat level of participants is above 8. Such challenges will be listed appear with a "+exp" signature.
If the "TEA" option is on, the formula for calculating experience is as follows:
Exp = [Total exp of team] * ([Character level]^2 / [Sum of squares of all character levels] + [Character AP] / [Total AP of team]) / 2
Which means, the lesser AP deviation within a team, the more evenly the experience will be allocated, provided that the combat levels are same.
Faction skill points are then allocated in the same proportion as the experience.