Greetings, I was hoping someone could explain how to unlock the 400pt special Faction Leve Missions(the ones that drop runestones). Is there a direct path from leve to leve? faction points accumulate slowly and I'd rather not waste any ^^

also, can they be failed and then restarted like other leves? Do the runestones drop from enemies or just the chest at the end? do the lower cost versions of these missions drop anything of interest?

Thanks!