c´est bon j´ai trouvé c´est des cartes qui arrive aleatoirement ( envoyé par l´esprit ) , qui remplace une carte au hasard...
plus d´explications en anglais :
Kalas ( or Xelha, for
about 10% of the game) have a Guardian Spirit helping them. With this spirit,
they can do special attacks called Sacred Spring, Hellfire, Shining Seraph,
Demons of Darkness, Distorting Wind, or Lingering Time, each corresponding to a
certain element. These will replace a RANDOM card at the end of a combo, and
are insanely powerful, but they can replace a card you don´t want to be replaced
with, or be of the wrong element. But once again, they´re random occurences.