Editing Unification Wars (Hektor Heresy) (section)

===The Infiltration of Tarrant===
{{Main|Life Bringers#The Unification Wars}}

The infiltration of the Hive of Tarrant became the finest hour of the [[Life Bringers|Twelfth Squad]] of the Sacred Band led by Harel Meglin. Owing to the unique properties of the geneseed of their Primarch [[Johannes Vrach]], the members of the Twelfth displayed a well above average level of resistance to toxic agents, which determined their specialisation as hazardous environment specialists. Unfortunately, their skills in this field remained largely underused until the Merican operation stumbled over the great fortress of Tarrant, ruled over by a mad alchemist called Hermes Geber and protected by a thick layer of noxious fog that the Imperial forces couldn't advance through. Left with no other choice, Hektor Cincinnatus ordered the Twelfth Squad to infiltrate the Hive and disable the machines producing the fog, allowing the rest of his army to enter Tarrant. 

The members of the Twelfth took this mission very seriously, seeing it as a long-awaited opportunity to prove their worth. The first stages of the infiltration went successfully, but, due to their lack of stealth training, the Space Marines were detected by Geber's security on their approach to the fog machines. Determined to punish the intruders, the insane alchemist unleashed the most potent chemical weapon in his vast arsenal upon them: the Carnivorous Fog. Both Meglin and his close friend Hipocene Bubastus died to the deadly gas before their comrade Gaius Vira found a way to advance past it. Eventually, the Twelfth managed to reach the fog machines and destroyed them, thus allowing Hektor's army to finally advance.

Although the Twelfth lost their much loved commander in Tarrant, they found something that was arguably equally important: a successful new strategy. Theophrastus Salk, Meglin's replacement as the squad commander, was so impressed by Geber's usage of chemical weapons that he decided to adopt them for his squad. Equipped with new superior breathing apparatuses designed by their field medics Edentis Pneuren and [[Wilmut Sachs]], the Twelfth put the captured chemical weapons to test in their next major operation, the siege of Xebek. The new strategy proved to be a great success, and Salk's men were personally commended by Hektor for their inventiveness. A liberal usage of chemical and later biological weapons remained a signature of the Twelfth Legion up until their reunion with their Primarch, Johannes Vrach.