Ah - with the blood, you should specify that daemon blood is needed - and a lot of it too
It took me a while to figure it out.
Perhaps the necromancer should need another skill as well? Say tinkering or something like that - just so it's not TOO easy. Most shards have fast skill gain and for the necromancer to be able to make something that can slaughter the average player after just a few hours macroing - I think it should be a little tougher.
Also, can I direct your attention here:
Bulk Vendor (pwn)