The Ebon Blade and the Deathlord do -not- take direct orders from the Lich King. Iām reasonably sure that if you had the freedom of choice to turn down the quest OOC, you could will yourself not to do it, however I view it more as āmutual co-operationā towards the Legionās end. Itās interesting to speculate IC however, what influence the Lich King/Bolvar has over the Ebon Blade, but thereās nothing to suggest that heās leading or commanding it.
If that was the case, theoretically, there would probably be consequences, yes.
Itās logical to assume that given the current stance of the Ebon Blade in lore, that they wouldnāt take kindly to one of their number frolicking about committing atrocities unchecked. It was the āKnights of the Ebon Bladeā that were welcomed into the Alliance and Horde, not individual undead.
It seems likely that depending on how you go about role-playing, one of their number may see it as their responsibility to deal with you. Whether or not the Ebon Blade itself, as a whole, will go after you then probably not unless like I said before, youāre openly hostile to the organisation or seen as a threat.
Actions and choices always have consequences and itās good to take this into consideration because itās ultimately what generates good, immersive and developmental role-play. Ultimately, if your character just quietly slipped out of the fold and wandered off, I donāt think anyone would care. If you make a big song and dance about it, then they might. Itās logical.
The Lich King is essentially offering the Ebon Blade power during Legion and Death Knights with their eternal hunger, are more than likely drawn towards power to meet their own selfish or selfishly selfless ends. My character views it as mutual co-operation, because after what the scourge put them through, itās unlikely that theyād bend the knee to a ālich kingā ever again, if anyone at all. It simply wouldnāt make sense.
Whether or not the whole ārenegadeā thing is head-canon or not, itās an over-exaggeration thatās spawned and rooted from a position of logical consequence. It ultimately depends on your character.
If youāre going to go out of your way to be hostile towards the order youāre making a lot of noise/etc to leave, or commit deeds that give that order a bad name, then there are going to be consequences regardless of what any āofficialā position might be.
Thereās an implication that as a death knight, youāre forever bound to the Ebon Blade, but I think this would depend on whether or not youāre a third generation Acherus death knight.
Death Knights are singularly powerful entities. It strikes me as a tad unusual that they can roam entirely unchecked.
Truth of the matter is, you can be aligned with the Knights of the Ebon Blade, the Horde or Alliance, and still do personal things of your own accord.
If for example, my character wished to create distance between herself and Acherus, she simply would frequent it less often or just not bother but hey, where else is she going to have convenient access to runeforges, vital information about the state of affairs on Azeroth, training from experienced masters and veterans, and other resources?
It may also be presumptuous for me to make this assumption but Iām thoroughly convinced that at the very least, my character wouldnāt cower or feel distaste at the mere speculation of the Lich Kingās involvement with The Ebon Blade.
Death Knights are usually hardened by many tougher experiences than this. If on the other hand, Bolvar tried to assume direct control, it would be a fight between her buried pride and eternal hunger.
It would be interesting to say the least.