Unit type: Naval, sub

Movement: 5, sub (cannot go on shoals)

Vision range: 5

Fuel: 60, 2 used per day (5 when submerged)

Cost: 22000

Primary weapon: Yes

Secondary weapon: No

Ammo: 4

Commands: Submerge

Description: "B Subs can only attack at long range and are difficult to find when submerged."

Primary weapon: Cruise Missiles

Range: 4-5

The primary weapons of B Subs are Missiles. They can fire on the targets listed below.

Targets: Foot Soldiers, Vehicles, Ships, Subs (not submerged)

Against Foot Soldiers: Missiles inflict heavy damage to infantry.

Against Vehicles: B Subs are slightly weaker against vehicles than Bombers are.

Against Ships: Missiles deal extreme damage to most ships.

Against Subs: Missiles are extremely strong against subs, but can't fire on submerged subs.

Full Firepower damage chart:

Secondary weapon: None

Once B Subs run out of Missiles, they can no longer fire.

Defenses:

B Submarines are less durable than regular Submarines, but they still take inconsequential damage from most ground units. However, air units and other naval units deal significantly more damage to B Submarines compared to regular Submarines.

Summary:

Naval combat is lacking in most Advance Wars games until Days of Ruin. I wanted to add another kind of unit that can also submerge like Submarines, but I also needed to distinguish it in some way. There are already few indirect naval units, so I thought there wasn't any harm in adding another. B Subs are difficult to maintain, but their firepower can easily force an enemy naval response and also gives some more ways for naval units to combat land targets.