Two demon-like, shape-shifting sisters who organise death duels between great warriors from any universes. They're, like, a crossover engine.
The Corvidae appeared in Gail Simone and Aaron Lopresti's Wonder Woman vs. Conan mini-series.
(Diana of Themyscira) (Gail Simone take) (part #1)
Our main, Big Damn Huge Wonder Woman Profile. Tons of everything. Recommended reading.
As of July of 2017, this article was split into three part due to the aforementioned "big damn huge" factor. So that's more convenient to read, and this allowed for various small improvements in passim.
So now this specific article is the one with the quick intro, and...
This is the Golden Age version of Wonder Woman foe the Cheetah, later defined as the Earth-2 Priscilla Rich. One of the few recurrent enemies of Golden Age WW, and a curiously modern character (probably due to Moulton's background in psychology).