Carcharan took the form of a giant bat. Like the other Vampires (who in Lord of the Rings are fallen angels, or alternatively fallen Maiar) he was a servant of Morgoth and dwelt in Mirkwood. Carcharan only appears in The Lord of the Rings Online.
Trivia[]
Oddly, of the three named vampiric characters in The Lord of the Rings, both Carcharan and Gûlavhar, the Terror of Arnor persist long after Thuringwethil and her unnamed brood perished.