The Fallen Ghost DLC comes with a whole new skill tree for you to level up. These skills provide new drones, new marking mechanics, and other skills that will benefit you in your fight against the enemy.
A total of seven brand new skills are available, and like the main game, a single point invested in each will unlock the epic skill for this tree, Fast Reload.
Upon beginning the DLC you will spawn in as a level 30 Ghost with no skill points and all previous skills from the main game unlocked.