Yea Brightclaw works as a Necro
Only thing, bring henchies to kill the patrol of dragon moss / Kirin, also a longbow to pull Brightclaw and you stand behind the rock next to the stairs (in the water). May take a few tries pulling him, he doesnt always come and he turns around and goes back fairly quick.
Don't go too far towards him at the pull, guys drop down. Also watch for splinter weapon it does about 150 damage.
As for ele. E/A can farm TomTom Spiriteater in Mount Qanai(sp) pretty damn quick ... farmed him easily 150 times, no elite tome.
Not sure how far you are in NF with the ele, but it can also farm "Shakahm the Summoner" (I was the one that posted this kill on Wiki/PVX builds, I also posted it for Commander Sadi-Belai :P)
But hard mode and shakahm is a bit of trouble. He sets up spirits and sliver goes after those.
Might be easier on normal mode (for sliver to target him) but of course it won't produce a tome, but maybe his green
Edit, just read your post enitrely.
Rit Lord can be farmed using a Necro
Awaken the Blood, SS, Reckless Haste (Normal build, not much use in HM), Price of Failure, Accumulated Pain, Energy Tap, Spirit of Failure, Empathy
--- Curses 16 ---
--- Domination 8 ---
--- Illusion 7 ---
--- Inspiration 8 ---
At the beginning, although tempting, dont pull him because it'll aggro the carps. The wait for him to come back around is why I don't farm him too often. Once he goes around, it'll be about a minute before he comes back around. When he does, use a longbow to pull him, walk backwards and strafe when he's about to attack (it's obvious when he's about to) sine he does about 160 damage per hit (Hard Mode)
Pull him until your behind the wall of that little structure. You may have to walk back further so he comes closer and that your aggro circle is touching him allowing you to do the spells.
I found the video of it on youtube when I made my Rit. Still works.
http://youtube.com/watch?v=G36XwMgffPI
And came across this, a Ritualist farming him
http://youtube.com/watch?v=yzonzhAF_Jo
Not sure how solid it'd be stealing 35 health from him via VwK while taking 150 give or take.
Tried it to see if it works, can see I'm in Hard Mode.
Go with Necro, I had him dead within 25-30 seconds.
http://www.hidebehind.com/38B26C
(First try :P)