Stonk

Stonks are purple cloud-like enemies found only in the Airway in Mario & Luigi: Bowser's Inside Story, making a noise whenever they appear in battle. They have been influenced by the Dark Star. When Mario and Luigi fight these enemies, they may split themselves into four smaller Stonks, and circle the plumbers. If they do not hammer quick enough, the clouds will strike, and possibly poison them. However, the bros. would have to hit the right one - if the bros. hit a different one other than the leader, the cloud will dissipate. These enemies will also attack by forming new clouds and blasting them at Mario and Luigi. This attack needs to be avoided by jumping. This attack also has a high possibility of poisoning the bros. They are usually paired with Air Cannons and Airnapses. Stonks are weak to fire, so it is recommended to use Fire Flowers against them.

Trivia

 * The Stonks are the only enemies in the Airway that can also be seen out of Bowser's body without their eyes (they don't appear like actual enemies).