Blat

Blats are creatures that live on blood. They gain the remaining lifespan of whoever's blood they suck. They fear sunlight, so they inhabit dark caves. For example, if a creature had 5 years left to live and a blat sucked its blood, the blat would have 5 years added to its lifespan. This alone makes them very dangerous.

Their fangs grow in almost immediately when they have their first taste of blood. They live in colonies of about 10-20 blats. Their eyes can detect sources of heat, allowing them to find food to eat wherever they are.