The Creeping Horak is an aggressively fast-growing Eternian fungus. When released onto a structure, it will rapidly spread to cover it completely, sucking out the oxygen in the process as all doors and windows are covered.
The Creeping Horak was used as a form of execution in a darker period of Eternia's history. Prisoners would be locked inside their homes as the Horak grew over them, allowing no escape. This is generally not done anymore as death by Creeping Horak is considered a horrible way to go, even for criminals.
Evil-Lyn once persuaded the villager Old Zak to give her the Creeping Horak and tried to use it to kill everyone inside the Royal Palace, but He-Man was able to destroy it with the Spellstone.
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