According to simulations run on different futures of Ignis and humanity, Revolver says that Lightning's is the only one that leads to mutual destruction.
And when an effect Special Summons it, 
it’s sent to the graveyard at the end of the turn.
Außerdem wandert er am Ende des Zuges auf den Friedhof,
falls er durch einen Effekt spezialbeschworen wurde.
Al invocarlo mediante un efecto
va al cementerio a final de turno.
E quando um efeito o invoca, ele é
mandado para o cemitério no fim do turno.