The High Elf archer legs, any chosen torso (knights, soldiers of the empire etc), new WH40K Dark Angels robed head or any head with a hood sculpted on, Soldiers of the empire arms (the new ones, choose ones without puffy sleeves) or militia arms and a scythe from either an undead wraith, zombie plastics etc.
That's the kind of parts I would use for such a conversion anyway!
Cheers,
Dante