The Relic (Legends of the Space Marines)

As Ghazghkull Thraka's second invasion engulfs Armageddon, Dreadnought Brother Jarold leads warriors from the Black Templars Chapter in battle against the greenskins in the frozen Dead Lands. Following a distress beacon, they find another Dreadnought in the ice, buried for half a century. When the orks attack en masse, the two Dreadnoughts make a last stand against the bestial invaders. Read it because
On the war-torn world of Armageddon, the Black Templars must find a relic buried in the ice of the Dead Lands if they are to survive an overwhelming attack by the greenskins.