Controllers decide whether the Monster is submerged (movement only), or surfaced (move or attack). Two of the monsters have breath weapons, Tiamat has ranked breath attack that works like a firepot. Leviathan has ranked breath attack that works like a firepot. The others have game-changing abilities such as moving in and out of fog banks (Mist Walker) - this ability is commonly called a 'fog hopper' - and eliminating masts or crew in boarding actions. Behemoth can copy another ability. Tsuro may move an opponents ship, (with proper dice roll).