Mantra
In Shingon and other schools of East Asian Esoteric Buddhism, the mantra of Ksitigarbha comes from the "Treasury of Mantras" section of the Mahāvairocana Sūtra. The effect of this mantra is producing the "Samadhi Realm of Adamantine Indestructible Conduct." This mantra is the following:
namaḥ samantabuddhānāṃ, ha ha ha, sutanu svāhā- In Chinese: wēng, hā hā hā, wēnsān módì suōhā (嗡，哈哈哈，温三摩地梭哈 / 嗡，哈哈哈，溫三摩地梭哈)
Read more about this topic: Ksitigarbha