When this card is sent to the Graveyard as a result of battle, toss a coin and call it. If you call it right, destroy 1 monster on your opponent's side of the field.
Rulings
Individual Card FAQs
If "Second Coin Toss" is active, and "Kryuel" is sent to the Graveyard as a result of battle, you can re-do the coin toss.