See...I can be helpful.
I more or less solo ranked a druid then a life-path shaman off undead due to their bad ass abilities against them.
If you want to rank off undead the whole way through you can go like this:
Galadon cemetary to...
Wraiths by Barovia or...
Demons at Loch (if that works for you) to...
Skeletons on 1st level of crypt to or...
Shadow Grove in the past...
Skeletons on 2nd level of crypts to...
Mausoleum, bearing in mind you don't have to go inside at first but can just kill the first zombie in by the key over and over to...
Skeletons at Barovia or...
Undead in the new crystal island place I never caught the name of to...
Eil Shaeria massive undead and, to a lesser extent, the aggro ones in the way or...
Organia weaker council members if the criteria isn't just undead, but just isn't real or mortal or whatever to...
Lich guild masters in Eil Shaeria or...
Lesser guys just passed the veil in Shadar Logoth or whatever that place is called now or...
Midgaard guards to...
Spirits or...
Calyndryl
In this list it's possible to hero everywhere that is Eil Shaeria and after, if slowly.
BOOM!!!!
Still got it.
*micdrop*