Nechryael can be found in the Heart of Gielinor. They can be fought for kill count for the Zaros faction. A Slayer level of 80 is need to harm them. While they count towards a Nechryael task, killing them here is not recommended as they only spawn around a node that is under Zarosian control. Equipping a Zaros insignia has no effect, as they are not aggressive.