Bloodveld leechers aid Vanstrom Klause in battle when summoned by him during the final fight of The Branches of Darkmeyer. Two leechers slowly approach Vanstrom from two sides. If they are not distracted and reach him, they will sacrifice themselves and heal Vanstrom. They appear to be smaller versions of Harold.
Bloodveld leechers, along with other bloodveld in Darkmeyer (bloodveld guardians, younglings and Harold), looks very different in normal bloodveld found elsewhere. Their bodies are purple rather than light brown, and have bat-like wings.