The 20mm Flak Cannon is a heavy weapon wielded by the Heavy troopers in the Wasenshi military.

The weapon is designed to fire heavy slugs that were commonly found in pre-war flak weaponry which was made to punch through hardened aircraft frames.As such, it is used to pierce through heavy fortifications when conventional weapons and tactics have failed. Due to the weapons heavy nature and what it fires, it is exclusively used by the heavy troops clad in the heavier power armour which can withstand it's immense fire power.