FYI, i found this on the official forums posted by some non official member, though it looks accurate. It is about group XP while playing a support character - healer.
Basic Rules About Earning XP
------------------------------1) Your supporting skills must be of the proper level to obtain xp.
- This means if your party are fighting low level 1 - 10 monsters you can use a level 1 heal skill and still get xp. However, you will not get any xp for using just one level 1 heal skill vs a lvl 30 monster. The higher the skill the better.
2) If you cast a supporting skill on a player and that player misses his/her attack, then you will not get any credit for the casted skill. No credit = no xp.
3) If you cast a supporting skill on a player and that player uses an attack skill instead of a normal attack, then you will not get any credit for the casted skill. No credit = no xp.
4) If you cast a supporting skill on a player and that player uses basic attack to damage a monster, then you will gain credit towards the casted skill and obtain GRP.
5) It is best to follow archers and warriors to gain grp (staff mastery mages can also be followed since they use basic attack as a primary weapon)
6) You can cast skills on people before the battle begins to improve your chances of earning grp xp on the next kill.
7) Healing pets will not give you any credit towards assisting the battle. No credit = no xp.
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Small group tactics to gain grp xp (1 - 3 people)
1) Watch for a leading player and support them.
- Look for the player that always begins the combat situations. Use your heal spells and enchantments on this player mainly.
2) Do not always give mana to everyone that begs you for it.
- In group situations mana is not needed for most classes, by giving mana to those who are begging for it you will be enabling them the ability to OVER DAMAGE the monster. Too much damage on one monster from one person can make grp less. Why? Because monsters only have so much life power, and a player must do enough damage to gain credit for assisting in the battle. You cannot earn credit without hitting, and you cannot hit if one player kills the monster in 1 hit. This goes back to the basic team work mentality of everyone does his/her part. Strive to make sure that everyone in the group gets a chance to do damage.
(combat example
Monster has 1000 life points
there are 3 players in the group plus you the conjurer makes 4
player 1 should not do more than 400 damage
player 2 should not do more than 400 damage
player 3 should not do more than 400 damage
Player 1 should do at least 250 damage to gain combat credit
Player 2 should do at least 250 damage to gain combat credit
Player 3 should do at least 250 damage to gain combat credit
Player 4 = you the conjurer, you should heal / enchant one person before they attempt to attack the monster to gain combat credit for that round.
Large group tactics to gain grp xp (4 or more people)
1) Watch for a leading player and support them.
- Look for the player that always begins the combat situations. Use your heal spells and enchantments on this player mainly.
2) Use area support skills and stand in the middle of the group. When the area skills are cooling down go back to (1)
3) Do not always give mana to everyone that begs you for it.
- In group situations mana is not needed for most classes, by giving mana to those who are begging for it you will be enabling them the ability to OVER DAMAGE the monster. Too much damage on one monster from one person can make grp less. Why? Because monsters only have so much life power, and a player must do enough damage to gain credit for assisting in the battle. You cannot earn credit without hitting, and you cannot hit if one player kills the monster in 1 hit. This goes back to the basic team work mentality of everyone does his/her part. Strive to make sure that everyone in the group gets a chance to do damage.