The White Steel Eel is one of the most fearsome monsters inside the Tower. It has gigantic, snake-like body covered with heavy steel armor. Steel Eels typically live in highly dense Shinsoo environment, so dense that normal people find it is extremely difficult to move in such an environment. The Eels, however, can move through it at extremely high speeds.

Steel Eels are usually quite passive creatures, but during breeding season, they need food, and also want to protect their young, and so will eat smaller harmless creatures. They typically breed in areas with a high density of Shinsoo, so dense that even Walhaiksong Rankers would have some trouble moving in it, except those with miraculous Shinsoo resistance.

One such eel was fought by Baam on the First Floor of the tower with the help of the Black March.