Hadraniel, whose name means “greatness of God,” is a Jewish Angelology gatekeeper appointed to heaven’s second gate. He’s said to be over sixty myriads of parasangs tall and a terrifying figure to confront.
Moses was reported to have been speechless with amazement at the sight of Hadraniel when he arrived in heaven to receive the Torah from God. Hadraniel didn’t think Moses deserved to hold the Torah, so he made him weep in terror, causing God to appear and chastise Hadraniel for his mischief. Hadraniel instantly resolved to be obedient and functioned as Moses' guide. This was extremely beneficial, because “when Hadraniel announces the will of the Lord, his voice penetrates across 200,000 firmaments,” according to Zoharic mythology. “With every syllable from his (Hadraniel’s) mouth go forth 12,000 flashes of lightning,” according to Moses' Revelation.
Hadraniel is one of seven servants to Jehuel, the prince of fire, in Gnosticism. Hadraniel speaks to Adam in the Zohar (55b) regarding Adam’s possession of the Book of the angel Raziel, which was thought to contain hidden information that even the angels were unaware of.