Things with Wings...
From RoR Wiki
Bestiary unlock for Giant Bat
Order & Destruction
Kill the bat Heartraker , a lvl 17 Champion, in Ostland. This mob spawns in several different locations.
Known spawn locations:
- 30k,46k
- 39k,40k
- 20k,29k
- 21k,28k
- 31.3k,45.2k
The killing blow is required to trigger the unlock, and will not apply to other party members.