Nocturnal Zerg Overlords by their general behavior often appear to be zombified in opposite of all other variants.

Nemesis Zerg Hydralisks are one of starting minions from Niadra and her Brood. Stronger and more aggressive. Difference between Nocturnal and Nemesis Hydralisks is Nocturnal variant hurls fluorescent and poisonous projectiles.

(Zerg Overlord and Hydralisk belongs to Blizzard)