For an idea of their HPs, I randomly killed 10 of these from all over the zone. On on one, strictly melee damage, no heals allowed, went as follows:
1 - 135
2 - 156
3 - 141
4 - 169
5 - 141
6 - 181
7 - 184
8 - 189
9 - 176
10 - 170
So they have on average 165 HPs, give or take depending upon level and necromancer buffs.