The NM is relatively easy to defeat (I trio'd it with a RDM/RNG, MNK/NIN, and I went WHM/SMN) and absolutely worth the time. I myself had awful luck obtaining it, 1/14, but I love the piece.
It's worth the time spent on camping the NM, the stats it offers are incredible, and the overall usage far outweighs Summoner's Doublet (in terms of general use versus situational).
Refresh helps keep a free Carbuncle at your disposal, plus costs 1 less mana to keep an avatar out, -5 seconds on blood pact is unrivaled, and +5 Enmity on your avatar lessens the chance of your target deciding it wants a piece of you. Unfortunately, the NM, Shikigami Weapon, is hard to find without wide scan, and drop rate is around... 25% from my personal experience (Ran 2/8 with 2 drops back to back)
Shikigami Weapon spawns 21 to 21 hours and 15 minutes after it last died. It has an innate ivisible effect and it cannot be targeted until it is aggro'd via spellcasting. This is a RDM type weapon, that can't be silenced. Just some more information about the NM.
Seriously....I need one please gimme ToD or help me get it ;; I'll pay unless ur super kind enough to help for free ;;...plz....on Seraph btw! going to bismarck soon,,