Day 30 covers all of Chapter 26, Dhāraṇīs
Having last month received Brave-In-Giving Bodhisattva’s dhārāṇis, we hear Vaiśravaṇa Heavenly-King’s dhārāṇis.
Thereupon Vaiśravaṇa Heavenly-King, the Protector of the World, said to the Buddha, “World-Honored One! I also will utter dhārānis in order to protect this teacher of the Dharma out of my compassion towards all living beings.”
Then he uttered spells, “Ari (1), nari (2), tonari (3), anaro (4), nabi (5), kunabi (6).”
[He said to the Buddha:]
“World-Honored One! I will protect this teacher of the Dharma with these divine spells. I also will protect the person who keeps this sūtra so that he may have no trouble within a hundred yojanas’ distance [from here].”
Lotus World offers this:
According to Chih-i, in his Words and Phrases of the Lotus Sutra, the four heavenly kings represent the four characteristics of nirvana or buddhahood as taught in the Nirvana Sutra: true self (Virupaksha), eternity ( Dhritarashtra), purity (Vaiśravaṇa), and bliss ( Virudhaka).
Vaiśravaṇa is the chief of the four heavenly kings. The Flammarion Iconographic Guide: Buddhism describes Vaiśravaṇa as follows: Vaiśravaṇa is the guardian of the north and the chief of the four guardian kings, ‘He who is knowing’, ‘He who hears everything in the kingdom’, the protector of the state par excellence, sometimes thought to be a god of defensive warfare. In China, he is considered to be a Buddhicization of the Indian god of wealth, Kuvera, the north being considered to hold fabulous treasures. He presides over winter and is black, so is also called ‘the black warrior’. His symbols are a jewel and a serpent, and he commands a large army of Yaksas.
Vaiśravaṇa’s army and attendants consisted of the kimnaras and the yakshas, two of the eight kinds of supernatural beings who are said to revere and protect the Dharma. The kimnaras are celestial musicians and dancers who have the bodies of birds with human heads and torsos. They officiate at Vaiśravaṇa’s court. The yakshas are a kind of flesh-eating demon or spirit who make up Vaiśravaṇa’s army.
Lotus World: An Illustrated Guide to the Gohonzon