Fyrnocks are silicon-based creatures that appear in the Disney XD animated series, Star Wars Rebels. They live on the planet of Fort Anaxes and are vulnerable to light, which burns and kills them. However, in darkness, they are deadly hunters. When Hera Syndulla and Sabine Wren stop on Fort Anaxes to find supplies, they are attacked by the Fyrnocks, which they keep at bay until the rest of the crew of the Ghost rescue them.
Later on, Kanan Jarrus and Ezra Bridger return to Fort Anaxes to tame and use the Fyrnocks as part of a trap for the Grand Inquisitor. Though the Fyrnocks succeed in killing his stormtroopers, the Fyrnocks ultimately are no match for the Utapauan. As a last attempt, Ezra taps into the Dark side of the Force, summoning the mother Fyrnock, which is much larger than the others. Though she is unable to defeat the Grand Inquisitor, her attacks give Ezra and Kanan enough time to escape him.