[Executor]

Depends what mages and spells you've got, and how many mages more importantly.

Bunch of slingers would tear apart those manikin also.

Rain of stones would be ideal, but I guess that's a little higher up the ladder.

If you're short on death mages for dust to dust than,
you have recrutable Vanjarls everywhere who are priest 2 and have blood, you can communion them for banishment and give some penetration items, but that also depends what undead you're fighting, some of them have MR 8 and some have MR 14. I think carrion beast have only 8.