Phanto

Phantos are large, seemingly living or possessed masks that can often be found guarding various treasures, most often keys.

Phantos appeared as semi-common enemies in Super Mario Bros. 2, often in caves or in vases. Phantos simply remain immobile unless the key they are guarding moves. Once this happens, a Phanto will ceaselessly chase whoever stole its key. Phantos cannot be avoided and can only be escaped by using the key it was guarding to unlock a door. If the player simply drops the key while a Phanto is chasing them, the creature will fly away and leave them alone, at least until the key is picked up again.

Two Phantos made appearances on The Super Mario Bros. Super Show!. The first one appeared in the episode "The Ten Koopmandments". This Phanto lived in a pyramid that Koop Tut had trapped Mario, Luigi, Princess Toadstool and Toad inside. Upon discovering the four heroes, it proceeded to chase them until they managed to escape from the pyramid. Another Phanto made a brief cameo appearance in the episode "Escape from Koopatraz", as a member of Judge Koopa's jury.

Trivia

 * The name "Phanto" appears to be a shortened form of the word phantom, which is a type of ghost or specter.
 * Phantos were referenced in Super Paper Mario. In Chapter 6-3, the Sammer Guy guardian of the 63rd gate is named "Phanto Grin."
 * Also in Super Paper Mario, Dimentio's face resembles a Phanto.
 * A Phanto Mask was one of many collectible treasures that Kirby discovered in "The Great Cave Offensive" mode of the games Kirby Super Star and Kirby Super Star Ultra. Kirby found the Phanto Mask in the Sub-Tree Area of the Great Cave. The Phanto Mask was worth 278,000 Gold.
 * The face on Phanto was originally less scary in Doki Doki Panic.