Perfect on the descrition, I think it gives me exactly the way I wanted, and even adds a few ideas to how the campaign will turn out. Occasionally I might ask for details about your campaign world, this okay?
As for the Abberant Mark, I was thinking something like this, since you want something that'll have social as well as game effects.
Mark of Forces
1/day you may sense elements as a Shugenja of eighth level. At the cost of one action point, no more then twice per day, you may cast charm monster on elementals only as a sorceror of eighth level.
This will allow you an ability of occassional use, and an imporant ability when the time calls for it. Elementals are vital in the command of many of Eberrons more powerful modes of magical transportation (the Airsihps, Lightning Rail, and Wind Galleon) are all linked with elemental entities, your charming there of should allow you occassional but limited command of such things if the need arises.