Is Nadir - Prologue: Slay the Six safe for children?

Not recommended

"Nadir" is a challenging, dark fantasy card game with turn-based combat featuring strong violence and a mature atmosphere. It's not rated by the ESRB and contains no language or sexual content, but its difficulty and darker tone make it best suited for teenagers rather than younger children. The roguelike format encourages repeated playthroughs for experienced gamers.