dangerous magic card from Yugioh
that can take you soul. Once played in a duel, a seal surrounds all duelists, trapping them inside and preventing others from entering. If a player's life points hit 0, the seal closes on them, and takes their soul. If all duelists lose their life points, the seal breaks apart and no one is taken.
Under the seal, more monsters can be played by the duelist who played the card. Their monsters gain 500 attack points and become dark.