Percy, Jason and Thalia: Massive hurricane
Leo, Calypso and Jason: Dust devil
Hazel and Nico: Large scale shadow travel, gem-encrusted skeleton warriors
Piper and Frank: Frank turns into a dragon while Piper charmspeaks the enemy
Reyna and everyone: You can guess.
Coach Hedge and the Hephaestus and Ares cabins: You can also guess.
Annabeth and Hazel: Navigating the Labyrinth
Meg, Grover, Percy and Will: Massive plant monster
Calypso and Annabeth (and possibly Leo and Percy): Magic nets and huge traps
Frank and Festus: Dragons!
Festus and Hazel: STEALTH DRAGONS!
Hazel and Piper: Supercharged illusions
Thalia and Leo: Lightning powered weapons