An Imperial Fists Deredeo Pattern Dreadnought armed with a Volkite Falconet Battery and four Boreas Air Defence Missiles.
The Boreas Air Defence Missile was a type of Imperial surface-to-air missile deployed on a Deredeo Pattern Dreadnought to serve as an anti-air defence system for Astartes troops on the ground.
A Boreas Air Defence Missile can target a separate unit from the Deredeo Dreadnought's main weapons and can even ignore intervening obstacles if the enemy is outside the bearer's line of sight.