They kill as well so long as it will make them some money. Though they each have different motives for working together none of them are exactly on friendly terms. They are called the seven deadly sins. They are assassins, the best in the world. They answer only to man the first immortal Vandal Savage a man so vicious, so cruel, and so ancient that even Ra's al Ghul would dare not trifle with him.
Vandal Savage formed this group long before the League of Assassins even existed. The group has gone by many names. The current members are a young prodigy known only as Bane he governs pride, the second is a former member of the League of Assassins she goes by Lady Shiva and she governs lust, third is Floyd Lawton aka Deadshot he governs greed, the fourth is Mathew Haggen he governs envy no one outside the group knows what his talents are, the fifth is shrouded in mystery answering only to the title of Mad Monk he governs gluttony, the sixth is an occultist calling himself Felix Faust he governs sloth, last is the leader a mysterious assassin calling himself Prometheus he governs wrath and in addition to being the leader of the seven reports directly to Vandal Savage of all the members
I know nothing of Prometheus's origins or why he serves Vandal Savage, but I do know this he in addition to being, the current leader he is based in Gotham and has been silently paving the way for his master's arrival his hobby is also training and grooming promising warriors. The Seven have throughout history been responsible for unexplained wars, assassinations, they have set the world on fire more times and toppled more empires than even the League of Assassins. If anyone were to make an enemy of them I would have only this to say farewell old friend.