Bloodybat

Granbats that survive eventually grow large from years of bloodsucking antics. They don't just suck the blood of other creatures, but their very life force itself. Swarms of Granbats follow their leader, turning nearby habitats into lifeless wastelands. For this reason, some regions of Isliid believe that on the full moon, with skies full of bats, the Grim Reaper itself flies to reap the souls of the living.