For battles with front and back hero rows. Do not apply the same figures directly to march combat.
Which faction has the advantage?
Rover has the advantage over Stalwart, Stalwart over Aeronaut, and Aeronaut over Rover. Attacking the faction you counter adds 20% damage. Check the opposing lineup before choosing your heroes.
Where do Mariners fit?
Mariners sit outside this three-faction counter cycle. Each Mariner adds 2% final attack and subtracts 2% final HP for the lineup. Two give +4% attack and −4% HP.
For the same-faction HP bonus, Mariners join the largest other faction. They do not count toward the extra counter bonus. Three Aeronauts and two Mariners display 21% HP and 4% Mariner attack, but no extra 5% counter bonus.
Should a pet match the faction?
Start with the role your lineup needs from a pet: front-row protection, back-row attack or a low-HP effect. Choose around who needs help and where they stand. If your front row falls early, look at survival before adding more back-row damage.