Source
From the release:
In the short time he has resided in Hell, he has built a storied reputation as a commander of men. his understanding of strategy and tactics is remackable and brilliant. He tends to put the survival of those under his command at the top of his list of priorites, so there is no shortage of troops eager to serve in his unites. This means Legatus has the pick of the best soldiers available in new Jerusalem. They are all eager to fight alongside him as they feel their chances of survival are greatly enhanced.