From Lexicanum

The Mortis Dreadnought is a rare Space Marine Dreadnought pattern used by the Dark Angels and their successor chapters.

It is armed with a pair of heavy weapons consisting of either two Missile Launchers, two twin-linked Heavy Bolters, two twin-linked autocannons or two twin-linked lascannons.¹

Notable Mortis Dreadnoughts

• Malach - Angels of Absolution, 6th tactical company ^1-p137

Images

Forge World:

Mortis Dreadnought with Missile Launchers	Mortis Dreadnought with Lascannons

Sources

• ¹:Imperial Armour Volume Two - Space Marines and Forces of the Inquisition, p137, p142

Space Marine Vehicles

Rhino Chassis	Rhino • Damocles Command Rhino • Razorback • Vindicator • Whirlwind • Predator Annihilator • Predator Destructor • Baal Predator • Sabre Tank Hunter
Land Raider Chassis	Land Raider • Land Raider Crusader • Land Raider Redeemer • Land Raider Helios • Land Raider Prometheus • Land Raider Ares • Land Raider Terminus Ultra • Hellfire Land Raider • Land Raider Spartan
Dreadnought Chassis	Dreadnought • Furioso Pattern • Mortis Pattern • Ironclad Dreadnought • Siege Dreadnought • Venerable Dreadnought • Grey Knights Dreadnought
Land Speeder Chassis	Land Speeder • Land Speeder Tornado • Land Speeder Typhoon • Land Speeder Tempest • Land Speeder Storm