Monster Manual (5.5e)
Vampiric Connection. While the familiar & its vampire master are on the same plane of existence, the vampire can communicate with the familiar telepathically, & the vampire can perceive through the familiar's senses.
Multiattack. The familiar makes two Umbral Dagger attacks.
Umbral Dagger. Melee or Ranged Attack Roll: +5, reach 5 ft. or range 20/60 ft., one target. Hit: 5 (1d4 + 3) Piercing damage plus 7 (3d4) Necrotic damage. If the target is reduced to 0 Hit Points by this attack, the target becomes Stable but has the Poisoned condition for 1 hour. While it has the Poisoned condition, the target has the Paralyzed condition.
Deathless Agility. The familiar takes the Dash or Disengage action.
Any Climate; Any Terrain