I'm not sure someone already had a similar idea but, why not replace Bravery Bonus with Party Bonus (PB).
Instead of using Bravery Bonus BB, which usually promotes solo play, why not implement Party Bonus PB which can promote grouping/partying.
It will work something like this:
It will not depend on the difficulty that you ran the quest, rather on the number of party members that ran the quest. You will get the xp bonus as long as you have a streak of finished quests that you ran with a certain number of people.
Party bonus: Running a quest for the first time a certain number of party members will grant a flat xp percentage bonus:
Members - Bonus
3 - 5%
4 - 10%
5 - 15%
6 and up - 20%
Streak bonus: Streak bonus stacks itself up to 5 times and the max bonus will still depend on the number of party members you ran with:
Members - Streak Bonus
3 - 20%
4 - 30%
5 - 45%
6 and up - 50%
For the 6 and up streak, as long as you ran a quest with at least 6 members, the streak will not be disrupted (raid quests)
The initial Party bonus and the Streak bonus stack with each other and with other standard first time bonuses.
Running a new quest with different number of party members will break the streak.
1) Since unlike BB where you can only run a quest on elite/hard once to get the BB bonus, a party can run one easy quest over and over with the same number of players, and get the desired XP.
- People have been doing this for a long time, especially on challenges. The XP depletion rule for repeating quests rule will still apply, and there will come a point where some players will need to log out or get bored or want to do something else
2) Multiboxers - no different from soloers with the BB streaks, they want to solo then, and they still want to solo now.
3) Panther, Owlbear, gold hires, and normal hires - same as soloers on the BB strearks, plus they will have to buy the expansions with permanent hires and buy gold hires from the ddo store (which is a plus for Turbine)
This is just a suggestion that might promote more grouping that soloing. After all, D&D, the DDO is based on, is suppose to be grouping game.