Mutated Vampire miniatures painted and slightly converted for Warhammer Fantasy Battle - or Age of Sigmar if need be. Those are Vargheists made by Games Workshop. In AoS they would belong to the Soulblight faction, Death Grand Alliance.
Terrorgheist miniature painted for Warhammer Fantasy Battle, or Age of Sigmar if need be. Giant undead dragon-sized bat. I gave it some simple swamp basing. In AoS it would belong to the Flesh-Eater Courts, Death Grand Alliance.