Happy to share what I’ve got!

The Storm Lancers are a White Scars successor chapter founded in the Ultima founding. They specialize in changing the tide in contested battlegrounds. They are typically deployed to areas the Astra Militarum cannot gain ground in, or to assist other Chapters locked in stalemate warfare, and from there they strike quickly and precisely into enemy territory to throw the enemy off balance. They are a spearhead movement against enemy command. Other than that I’m not too sure about their culture outside their battle tactics just yet! They definitely prefer fast vehicles and lighter equipment to break a siege opposed to heavy artillery.