One of the ORISHAS, he is an ancient hunting deity specializing in weapons of iron. Spears, knives, blades — and presumably nowadays guns and missiles. His powerful spirit lives inside metal and bestows his strength upon it.
He also deals with justice and oaths. It’s common to invoke his name in an oath, but you need to touch a piece of metal while doing so. Preferably something weapon-related, such as the business end of a spear or nuclear warhead.
If you treat OGUN with respect he’ll be trustworthy and protective. So don’t leave your tools out in the rain.