2 players from same guild = 2% xp bonus, 3 guildies = 3% etc makes joining an active guild more meaningful.
xp bonus based on number of quests completed together. Reset whenever leave group. Say 0.2% per quest up to a maximum of 1 % per player in the group. So 4 people form group run 5 quests get 4% party xp bonus. Player 4 pulls wife ( or husband ) agro and has to drop. Bonus is now 3%. New player joins, runs quest 3.2% etc ..
Party balance xp bonus. 4 epic spheres categorising classes so 1 class from each sphere in group = small xp bonus. Say 4 %. Hires don't count. Encourages class diversity in groups.
Past lives xp reward bonus to account. Encourages experienced players to make more characters. Join in with the new players. No idea how would be implemented. Maybe active alt character i.e. levelled within last 7 days = 1 % xp bonus to account.
probably all been mentioned before but was bored so posted
