It will fetch your mods and characters, and find the best set to equip for each character in a list you provide.
Then, with his Battle Meditation, he will spread that buff to the whole team: everyone will be able to ignore a good portion of Sion’s armor, and will consequently hit significantly harder. In addition to this core trio, you will need Hermit Yoda (heals + even more assists and higher damage with Master Training) and Young Han Solo.