Only Big Stars in a character's stats matter; "Small Stars" are just progress toward the next big one. Use stat-up items when a character is furthest away from their next big star to get the most value.
When a unit's Morale hits zero, they are permanently removed from the map. If a character is dangerously low, use the Preparation phase to "eat" an edible item or equip gear that restores Morale. Essential Beginner Tips Yggdra Union
Unions allow multiple units to participate in a single clash. Positioning is everything. Only Big Stars in a character's stats matter;
Try to finish maps quickly to earn the MVP bonus , which gives permanent stat boosts to the unit that dealt the most damage. Yggdra Union