Hags Snakes Require water to live and can be encountered anywhere with a large enough body of water, These mutant snakes. They are descendants of the pre-War Hagfish, an eel-like slime-producing marine animal. The thick layer slime allows them to move very fast and almost silently making them a perfect ambush predator. Hag snakes are Common in the swamps of the  Hub Delta and can often be seen swimming down the flooded streets. as Hag snakes grow to fit their environment they vary in Size ranging from 2 or 3 feet all the way the way up to 90 to 100 feet in length.