Any good necro strategies?

[Qrt]

20 pts into bone armor

That's not the optimal way of using 20 points on your bone armor:

1 pts in bone armor and 19 in bone wall gives a much stronger armor due to the weird synergy that gives five more points of armor per point in a synergy (bone wall or bone prison) than if you put the point in bone armor itself.

So that's 95 armor points more in your BA if you use the synergies. :)