Fyrnocks were ferocious creatures that inhabited Fort Anaxes. These animals were unable to be exposed to sunlight due to their skin's sensitivity, which forced them to use the cover of darkness to attack their prey. Though, inorganic light had no effect on them.
The creatures once attacked Hera Syndulla and Sabine Wren, but were driven off by the use of Rhydonium explosive barrels. Kanan Jarrus and Ezra Bridger later took advantage of their presence to set a trap for The Grand Inquisitor, and awoke a massive Fyrnock in the process.