Because they are balanced around the fact that they inflict poison, it is better to recruit units that do not innately have poison (as they will receive the benefit from his bonus).
It should be noted that poison does not stack, so units that have poison attacks already receive no benefit. That Ghorst provides poison attacks to his entire army (when chosen as your first lord) is a huge boon that drastically improves the effectiveness of his army. Corpse Cart units receive bound spell "Lesser Raise Dead".+15 Armour for Zombie units (Lord's army).All units in Helman Ghorst's army receive poison attacks.Summons a unit of Grave Guard, or a Wight King if overcast. Awaken from the Grave - Unique, replaces Raise Dead.Helman Ghorst uses a combination of spells from the Lore of Vampires, and one unique spell. ↑ Spellcaster: This unit can cast spells.Fire is known to harm this healing process, so be warned that flaming attacks will cause more damage to units with Regeneration. ↑ Regeneration: Regeneration allows a unit to heal while in battle.Now, he is carried through the night on a bone-ridged cart, pulled not by horses, but by the brothers he so desperately wished to save – each a once-handsome farrier restored to a mockery of life, forced to stumble along at the head of their kin’s unloving host. Rather than killing Ghorst, the Count revealed further dark secrets to him, transforming Helman into something beyond the grief-maddened man from Templehof. It was here, forsaken in a corrupted land, that he attracted the attention of Mannfred von Carstein.
Inevitably, he drew the attention of the Witch Hunter, von Kordon, and so abandoned Templehof and fled to Vargravia, taking the corpses of his brothers and father with him, determined to find a way to return them to life through Necromancy. The loss of his father and brothers to plague sent Ghorst into an obsessive madness he began studying the black arts in the hope of returning his lost kith to life. Helman Ghorst was once a man, yet that life was ripped from him by the uncaring vicissitudes of fate.
What is death but an obstacle to be overcome? There is no true death beneath the eternal night.