What is a war master?

A war master as of now is there are two War masters.

Mecha Kong that can only be purchased. The second is an Airship, when you reach a certain level you will unlock the airship. This one is free.

A War Master is a force multiplier, an additional increase in your troop strength. There are two that I am aware of as of 06/19/2023; They are the Air Ship, which is basically a battleship attached to a Zeppelin that travels with your troops and provides air support. This is an easy one to get as it is in the main play of the game. You will be given the opportunity to add it as you level up. The other is the Mecha Kong which is much harder to get; this one you will have to purchase, and it has a hefty price tag. However, Mecha Kong is a force to be reckoned with; he is a massive ape with technological armament, and he is awesome to see in battle. He becomes available as you progress and clear the fog near the waters where your ship is anchored. I hope this helps.