User blog comment:Egyptian Hybrid/What happened to the other Leviathan?/@comment-1031724-20170421012611

I don't know. Ever since Dick died we haven't seen any Leviathans, except for one in Purgatory I think. Maybe they became more vulnerable, or maybe they just don't attack anymore without their leader, or maybe they were banished to Purgatory (they were sent there alive, except Dick is now there in death)

Also, Dick wasn't the only Leviathan killed in Season 7, he "bibbed" Dr. Gaines forcing him to eat himself, and later ate the Leviathan Victor (I think) for his failure