Crawling-One

"These arachnid-like enemies will ran the pain from Sonic from above, dripping liquid acid from their eyes as they crawl on the walls and ceilings. They'll also slash with their razor-sharp front pincers. The Crawling-Ones' mobility is limited, however–they cannot land on flat ground."

- Description, Sonic and the Black Knight

The Crawling-One is an enemy that appeared in Sonic and the Black Knight. It is one of the Knights of the Underworld, specifically meant to tackle any opponent on walls.

Appearance
Crawling-Ones are humanoid-arachnid knights with two long pincers that allow it to attach itself to walls. Colored mostly brown, it has a helmet with twelve air-holes to breath and see. Their eyes have liquid acid, in which can drop.

Powers and Abilities
Crawling-Ones have the ability to climb up ceilings and walls easily thanks to its long, sharp blades, which can be seen as its fingers. The enemies are also very agile, in which they can simply attach itself to walls with balance as well as without falling. The blades can be used to slash Sonic the Hedgehog as he is climbing a wall. However, Crawling-Ones have a limited mobility to land, as they can fall without landing on the ground.

Sonic and the Black Knight
Crawling-Ones have made their only appearance in Sonic and the Black Knight. The enemies will only appear when Sonic the Hedgehog, or one of the Knights of the Round Table–Sir Lancelot, Sir Gawain, or Sir Percival–are advancing on walls. They can be easily defeated with a slash of the character's sword.