They can take mimic a particular human form following contact, or if they obtain some DNA from a person. They are then aware of all that person's thoughts and feelings, and even hallucinations.<ref name="seven06"<[[7.06 Slash Fiction]]</ref> When wounded they "bleed" black goo.
The number of Leviathans that escaped from Purgatory is unknown. There is a leader - [[Dick Roman]] - who directs the other Leviathans <ref
name="seven02">[[7.02 Hello, Cruel World]]</ref>
==Powers and Abilities==