From publisher blurb:
In this release, the theme is valor and battlefield ferocity as we cover two non-spellcasting classes: the berserker and the marshal!
The new berserker archetype is the Linebreaker, a fearsome shock trooper on foot or atop a mount that can shrug off damage as they charge, shake the ground with their footsteps, and send enemies flying!
Or perhaps the new marshal archetype, the Valorous is more your speed. These gutsy marshals can push their allies to fight through fear, wound fearsome enemies and even survive when they might have otherwise perished.
And the new Warleader synergy feat chain allows you to combine these two archetypes or any other combination of berserker and marshal into a formidable warrior who can wield both fury and leadership on the field of battle.