Board Thread:Questions and Answers/@comment-29106566-20150116193849/@comment-25813566-20150116231620

Maybe killing/co-working with them will be part of future major quests? Maybe they will be giving you these major quests? I personally think, that each of major quests (if there will be some of them) will be ending with killing major-boss-character or claiming major structure (only my thoughts, not real informations). And of course, if it would be possible to code that everything at all.