Yes, but they really really suck against anyone who has a D1 caster. They only have a 'Soul Leech' attack (weapon 269), and it does nothing to longdead/soulless. Breath of Winter doesn't help either of course.
Here's a debug dump of a Mind Lord doing no damage against longdead (only one actually passes the MR check, but it's irrelevant: none take damage).
Code:
Weapon Soul Leech has an aoe 1
blastsqr: unr622 x25 y16 aoe1 dmg0 eff103 spc135297 as-1 al0
affectvic vic624 hv2
hitunit 622 624 dmg0 spec135297 ba1
spec_mr pen 12 mr 9 (unr 622 vic 624 dmg 103 eff 0)
resisted
affectvic vic625 hv2
hitunit 622 625 dmg0 spec135297 ba1
spec_mr pen 12 mr 9 (unr 622 vic 625 dmg 103 eff 0)
affectvic vic627 hv2
hitunit 622 627 dmg0 spec135297 ba1
spec_mr pen 12 mr 9 (unr 622 vic 627 dmg 103 eff 0)