A Flederkatze (“flitter-cats”) is a magical creature that appears to be a mix of feline and bat-like features. It has dark fur with leathery wings sprouting from its back. Its head is cat-like but with bat-like ears. A flederkatze can fold its wings close to its body, appearing to be a normal cat unless closely inspected. A flederkatze has exceptional hearing, including a form of echolocation with a 120-foot range; normal invisibility is easily detected, but magical silence effectively negates this power. Its actual eyesight is quite poor (roughly 30 feet), and it suffers discomfort in bright sunlight (-1 attack penalty in bright or magical light).

A flederkatze attacks with its claws and bite like other felines. Its bite contains a toxin that causes 1 additional point of damage each round for 10 rounds as the poison travels through the body. Each round the affected can roll a save vs. Poison to halt any further damage, although subsequent bites will produce the wounding effect anew (resetting the 10-round duration). Only one such point of poison damage is applied each round, even if multiple bites are scored without successfully saving.