Documented traditional beliefs, sourced from real ethnographic and religious-studies scholarship — not a complete pantheon, and not a claim about what any individual believes today.
In Igbo tradition, Amadiọha is the deity of thunder and lightning, understood to represent the collective will of the people and to strike down those who swear false oaths or violate serious taboos. He is invoked as an enforcer of justice when human courts cannot resolve a wrong.
Source: Igbo cosmology. Researched through Wikipedia's Odinala article, whose reference list names Onunwa, Uchendu and Diala. Those works were not consulted directly.