Thanks for your feedback!
I think we are talking about different species of mushrooms.
Satanic mushroom is in Latin Boletus satanas. It has a lighter cap (beige, grayish) and is poisonous. Here's photo from Internet.
Our dubovik (or synyak) is in Latin Boletus luridiformis. His cap is dark brown. It is conditionally edible, it should be boiled for at least 20 minutes and the water drained. This is a rare mushroom here, but we ate it.