Hello Yinka, Are u a nigeria?? Anyway.I am a nigeria and i know little about this frat.
The frat are of 2 different types,
1.)The Ogboni Fraternity
2.)The Refromed Ogboni Fraternity.

The Refromed Ogboni Fraternity is a cult society and they dont involve in bad activity, They are good people and they pratice christian religion, They help them self and they dont drink blood or harm them self,

I think The Ogboni Fraternity involve in the dirrty act and ritual aspect,

To conclude ,The Refromed Ogboni Fraternity are nice and good people,

There is difference between the two.
Thank You.