大毘盧遮那成佛經疏 20.9

20.9

The sixth fire deity is named Wrathful (Krodha), and his mantra and the like are derived from this name and meaning, as above. His body is smoke-colored, meaning neither very dark nor very pale. One of his eyes is closed (like the deity Acala), and his hair is disheveled and pointing upward like a tangled mane. He assumes the form of roaring loudly, which means an appearance like opening the mouth wide and roaring loudly. Four fangs protrude from his mouth, two above and two below. This also encompasses two elements: one is fire, and one is wind.