This is a concept art based on the character of "Thaddius Brood", a summoner in the card game 'Splinterlands'. The Lore of this card says: "Messing with the dark arts should not be taken lightly. But that was the risk that Thaddius Brood took, and it wasn't long before he got in touch with a dark entity that drove him into madness."
You can play the game using this link:
Splinterlands