Elut, I do not recommend using Nibelung. I used it for a few weeks in 10-man and 25-man raids (the 264 version) and have recently switched back to
. Illumination is without a doubt a far superior staff, despite being 19 levels below. A 264 mainhand+offhand would be better, but it's even stronger than 50771
in most situations, given that Hit Rating is so frequent on gear (to the point where I have a more difficult time trying to find places to get rid of it).
I don't believe that the Scorch debuff counts as a secondary spell. Real ways to increase the frequency of Nibelung procs involve Molten Armor and Frostfire Bolt (or Frostbolt with Fingers of Frost). Every time you get hit by melee and Molten Armor procs, it is considered a spell cast, and Nibelung can proc from it. Molten Armor also has a guaranteed reflection. I've been hit multiple times and Molten Armor has reflected in such a way that it has caused two Val'kyrs to proc from what would normally seem like one hit (though you cannot get multiple Val'kyr procs per cast). Two points in Molten Shields extends this to ranged attacks and spells that hit you. As such, I see a lot of Val'kyr procs in PvP settings.
Nibelung is definitely a bad choice for Blood Princes and Lich King. They end up attacking the wrong targets routinely, and unless you are a Frost Mage with Water Elemental out, you cannot give pet commands to the Val'kyr (tried it, with multiple macros).
They have a vastly shorter duration on Blood-Queen, due to the AoE pulse (they will appear to heal from it, but they cannot heal faster than the incoming damage, so eventually they will die). They can easily die in the flames (frost damage) on Lord Marrowgar (which most often happens in Bonestorm phase, since flames shouldn't be a problem any other time if you're standing close enough). They can prematurely die on Festergut (Pungent Blight, and I'm not completely sure, but I think Vile Gas can affect them if it hits you). They can die on Rotface pretty easily to the Slime Spray (because they won't follow you out of it). They can die to a number of things on Putricide.
The problem is that Nibelung requires a set amount of procs to ensure that its DPS is competitive with other 264 items/combinations. I ran some numbers in Rawr and my findings were that, compared to
needs to proc 7.14 Val'kyrs on a 5 minute fight to be on par with it. Compared to
, it needs to proc 5.24 Val'kyrs. Compared to Illumination, it needs to proc ~3 Val'kyrs.
Numbers on meters may be a bit misinforming. The easiest way to look at Nibelung, for instance, is to look at the percent of damage that the Val'kyrs are doing compared to overall damage. Yet this is relative to how much damage each caster is doing. Naturally, Rawr has me doing much more DPS than I ever would be doing, so in Rawr, the Val'kyr damage percentage is a lot lower (around 3-4%) than what it usually is (5-10%). That doesn't mean it's a great staff though. It's nice for the spellpower (especially the 277), and it's great in PvP. It's also really fun on trash pulls... but I don't think it's a great investment for anything else. And since it's effectively broken on Lich King (Val'kyrs routinely were doing ~65% of their damage to Ghouls), it doesn't mean that much to me in PvE anymore.