The Sithspawn erathyrs were the foul creation of the Dark Lord Evxa-Uun's alchemists by mutilating the peaceful erathyrs into violent blood-sucking bat-like monsters. The Sithspawn erathyrs had large leathery wings that stretch to thirty centimeters and vestigial horns tipped with poison. Their fangs could puncture armor and their limbs were capable of snatching up Jedi prey and feeding on them.