Alright, so I've heard that Chthonic Entities are strong, so is it wise to try and summon one? And what are they, exactly?

I have couple/few questions as I am interested in Religious Satanism from JoS, I am also interested in LaVeyan Satanism as well as their philosophy is in a way interesting to me and I completely agree with it's concepts on that we should better ourselves and should maintain spiritual strength...