A newly developed subaquatic Seal type robot. Its breath can freeze the water around them in an instant, creating obstacles when Sonic needs to look for air bubbles.
— Sonic The Hedgehog 4: Episode II Website
Steelion (ドドン Dodon?) is an enemy that appears in the Sonic the Hedgehog series. It is a mass-produced, seal-based Badnik model created by Dr. Eggman that roams the underwater areas of White Park Zone.
Steelions bear a strong resemblance to sealions. They are mainly purple with pale yellow underbellies and muzzles. They also have black noses and black eyes. They also have small gray claws on their front flippers and pale yellow rear flippers.
In Sonic the Hedgehog 4: Episode II, the Steelions only appear in the underwater areas of White Park Zone Act 3. In gameplay, Steelions attack by emitting a freezing breath in front of them, usually as soon as they spot the playable character. This breath causes a small area in front of the Steelion to turn into a chunk of ice. The primary reason for this attack is to block the paths around the playable character, thereby preventing them from taking shortcuts or reaching safer areas. In addition, should the playable character get caught within the vicinity of a Steelion's freeze breath when it is performed, the playable character will take damage. Because the Steelions tend to perform their attack as soon as the player approaches, they can be hard to defeat.
Powers and abilities
In addition to be designed to be aquatic swimmers, the Steelions can emit freezing breaths from their mouths which can instantly freeze large amounts of water around them.