While the fighting against the Imperial Guard on Kronus is something the chapter - and the Imperium as a whole - would rather forget a fragment of a journal from the 102nd company of the 1st Kronus Liberators was found detailing a bolt pistol with a distinctive report the writer called the "sound of doom itself stalking our men".
It is a one handed bolt pistol that does 5.9 damage per second.
It is a level 4 piece of wargear.
It gives the user +2 melee skill.
It can only be used by Thaddeus.