Slime

Slime is a liquid obstacle that appears in some of the levels in Sonic and the Black Knight. Touching this substance causes various, though mostly negative, effects on the player.

Description
Slime is a thick, gooey, and oozing, yet runny substance that falls down from the ceiling in large amounts, forming puddles in over a meter in diameter when they land. It can usually be encountered when passing through tunnels or narrow passages, hinting Slime requires dark and moist environments to be produced. It comes in three known types, depending on the its color.

When making physical contact with a puddle of slime, such as when stepping into one, it creates certain effect, which is determined by the slime's type. A puddle of slime can be destroyed when hit with a swing of the player's Sacred Sword, however, without causing any effects at all.

Purple Slime
Purple slime is the most common form of slime and is found in places such as Deep Woods, Titanic Plain and Knight's Passage. As its name implies, it is colored purple. It is a toxic substance that, when making contact with the playable character, poisons the playable character and causes the player to lose up to five Rings over the course of a couple of seconds. The more puddles of purple slime the playable character makes contact with, however, the more will the number of Rings that the player loses for the few seconds increase.

Green Slime
Green slime, as its name implies, is a green-colored slime and is found in places such as Deep Woods. Unlike the purple slime, the green slime is an acid substance that causes acid damage to the playable character when making contact with it, though the player does not lose any Rings.

Golden Slime
Golden Slime is an extremely rare type of slime that is colored golden yellow and is said to bring good luck when stepped on.

Unlike other types of slime, the golden slime does not have a permanent location, but instead has a small chance of randomly appearing in the place of other types of slime. Also unlike other types of slime, the golden slime does not inflict an status effect on the playable character during the level, but instead unlocks Achievement 10 in Vault 7 in the game's Gallery when making contact with it, which specifies that the player has encountered some golden slime.