So Elise is steadily delivering dangerous magical artifacts into Noxus...

And if we all know one thing from fantasy literature, movies, and games, it is that you defintely shouldn't meddle with undead and/or corrupted artifacts unless you really, REALLY know what you are doing and/or you created them in the first place.

Sure, the Black Rose will use them for whatever they are useful of, but that doesn't mean they truly understand the purpose of these things. That means, every single one of these things is a potential ticking timebomb. And now we have to keep in mind that Noxus' old ruler, Mordekaiser (who owned Noxus before Noxus even was Noxus) is the big boss on the isles who would definetly have an interest of getting his old "fortress of unspeakable evil fitting for a dark overlord" back. Also, he might be a little homesick.

I would absolutely not surprised if suddenly several seemingly harmless artifcats suddenly activate by themselves and open a portal to the Shadow Isles or anything... or if some of the artifacts secretly corrupted the users to take subconsious orders from the Black Mist, tasked to replicate the original curse, just on another location.

And while I am aware that Noxians are downright THRISTY for strenght and power, in this specific regard it seems to have knocked out their common sense. Let's hope that Swain and/or Darius aware what's going on in his city before it is too late...