The Valyss Grip Event is a fun way to include a side quest in the game. If the player fails a strength roll, the player's party leader is taken and must fight a Valyss in flight before being dropped in a nest of newly hatched Valyks.
Valyks were night creatures designed to exist in this world as combination werewolf-vampires. When we came up with the "Valyss Grip" we expanded the lore that Valyss were female Valyks, powerful hunters for their young. After beating the Valyss and the Nest of Valyks the player is rewarded with two loot cards, and can return to the party.