Solo xp.
Fighting lower than your level:-
Up to lower than 20 level mob of your current melee level - 800xp-1000xp (depending on type of mob)
Matching mob with level - 1000xp-2000xp (depending of type)
Up to higher than 50 level mob of your current melee level - 3000 xp
Mob way greater than your level (up to 80-100 levels higher) - a "difficulty" bonus of up to 1000xp (depending on type) giving a possible 4000xp
Team xp
Reduce the xp by 100-500 depending on type (each would gain 2500xp instead of 3000xp on a mob that over the level of the group), with no difficulty bonus regardless of levels.
Just a rough suggestion and im sure more can add to it.
