I really do like the idea of semi-quanta pillars that generate 2 random quantum of the 4 elements that group is. But 2 is way too much for such a small group, comparing this to quanta pillars you should get 1. But then, why have random in the first place?
Perhaps they could generate 1-2 random quanta of the group elements. That way it will be slightly more balanced yet still an improvment of the 1 of you'd get from a normal pillar.
And maybe you could choose a group at the start (and be able to change for a small fee, like you do with marks) and then have some specilized quests for each group such as beating the opposing FG, so Decay have to beat Morning Glory/Miracle/FireQueen etc.
Just throwing some ideas around. But i think we really do need some new quests, the current ones are done in an hour or so then forgotten.