You may have been looking for Book 20
Winglets: Battles, the 20th Winglet, was really, really weird.
Fatespeaker is co-queen of the GalaxyWings. But when the DeathWings need her help, she must lead her tribe into battle.
The GalaxyWings recieved a message from the DeathWings, pleading their help.
The GalaxyWings are in the battle with the DeathWing allies. They help rescue the DeathWing Queen.
The two tribes win the battle. A lot of dragons die, but everydragon is still happy.