Well, the intermediate LA ermor priests (Lv2) can reanimate undead horsemen
LA ermor can reanimate as following:
Undead Lv1 Priest: Ghouls, Soulless, Longdead warriors
Undead Lv2 Priest: Ghouls, Soulless, Longdead warriors, Longdead Horsemen
Undead Lv3 Priest: Ghouls, Soulless, Longdead warriors, Longdead Horsemen, Lictors