You gain the bat-like power of keen hearing. This dark gift grants you advantage on Wisdom(perception) checks that rely on hearing and you gain tremorsense up to 60 feet.
You grow the large, dry, leathery ears of a giant bat. You are vulnerable to thunder damage, and particularly loud noises can force you to make a DC 10 Constitution saving throw or suffer the stunned condition, at your DM's discretion. Additionally, you have disadvantage on Wisdom(perception) checks that rely on sight.