Buff skills are useful in tipping the scales of fate in your favor. With them, you can generate Brave points, boost up stats, reduce damage received, hasten ally turns, or even summon additional allies.
Notable skills include:
The true value of Supercharge and Sacrificial Altar shine through when utilized with certain item combos, allowing for 5-10 Brave points instantly at the start of any battle.
Cat Barrier is the only skill that eliminates all Hate that the target has generated, effectively causing the AI to target other units.
All 1 cost row AoE buffs are extremely efficient as they either raise a single stat by 2 points, raise two stats by 1 point each, or vastly increase Brave gains as a result of attacking.
Suigetsushin, when combined with wait reduction items, can make use of its natural 0 delay to buff and then instantly act again.
Barriers with different values (-500, -1000, -2000, etc) can stack, allowing for some extremely effective tanking to mitigate sudden enemy attacks within scrolling battles. Also Wall of Babylon can be used to nullify dangerous single hit attacks with little risk.
Eppur si Muove is ridiculous in that it allows you to simultaneously give triple action to two allies, allowing for 6 consecutive turns as long as they're using skills without any wait time.
Fengshen Pedestal is particularly amazing due to the summoned unit, Cowrie, being the only unit in the game with both healing (Heal Aura) and Brave generation (Supercharge), plus it has the best speed buff in the game (Speed Boost).
Organon is the best buff in the game, bar-none. It raises all stats by 2, clears negative statuses, and grants double damage for the next hit to an entire row of allies.
Les Propheties is the only skill that can effectively eliminate delay for your entire team while also pushing all enemy units to the end of the turn order. If used well, it can set up huge combos of multiple repeated actions.
Note: Stat +1 buffs can stack up to 3 times for a total of +3. Stat +2 buffs can stack twice for a total of +4. Any differing types of buffs can also stack freely.
Edit
Buff Skill List
