Well i seen many necro and when it come to the mage they are not really worth it. As for the revive they are deff. not wanted.

Well here is what i would do.

PvM

20 Skeleton Mastery
20 Raise Skeleton
1 Summon Resist
20 Bone Spear
20 Bone Spirit
10 Bone Wall
7 bone prison

PvP

17 Teeth
20 Bone Spear
20 Bone Spirit
20 Bone Wall
20 Bone Prison
5 Lower Resist