This is a creature that I used in the recent “Justicar” project that I really liked. They make nice “lesser vampires” that serve a greater vampire and help to build tension. Created in Swords & Wizardry style.
Vampiric Brood
Hit Dice: 3
Armor Class: 5 [14]
Attacks: 2 claws (1d4), bite (1d4 Strength Drain)
Saving Throw: 14
Morale: 10
Special: Undead immunities, Strength drain, surprise,
psychic link with master
Move: 9
Alignment: Chaos
CR/XP: 4/120
Vampiric brood are not yet vampires but languish in a preserved undead state. Creator vampires only allow them to feed on animals and keep them weak enough to bar rebellion. An exception for brood feeding may be made when the creator allows the brood to hunt humanoids in order to fill themselves with blood and return to the creator who then feeds on their spoils. This must be done on the same night the blood was collected by the brood. Brood minds are in the clutches of the vampire that created them, and their free will is reserved until such a time that creator destroys them or turns them into proper vampires.