In the backstory, the parents of the main cast fought the Emperor possessed by Creed to a draw. The most powerful man on earth and a handful of unknown Somatics stop him cold.
Kohaku gaining her shard of courage and wiping out a bunch of monsters to save her brother and Shing. This moment is so awesome, everyone agrees she showed true courage. Also, she starts being able to fight after that - despite not possessing her spiria in full, she's still able to use her soma and kick ass from that point on.
A terrifying example appears when Shing breaks Creeds seal. He effortlessly slaughters Incarose and takes the party apart in a single attack, then takes all of two seconds to undo everything Lithia fought for over two thousand years.
During the Xerom attack on Straga, the General and Archduke finally put aside their differences and nearly give their lives in defense of the Empress.
Incarose trying to break Chalcedony by showing him the death of his two former companions in the Volcano. His response? Throwing it back in her face by pointing out they faced their deaths bravely and proceeding to slash out one of her eyes, cathartically riling her up for the first time in the game.
Creed attacks the party inside the sky whales Spiria, blasting them away with the same ease as before. Except for Shing, who slipped through the attack and actually slashed open his cheek in retaliation. Even Creed acknowledges that this was awesome.
Chal, Peridox, and Pyrox taking down an Incarose through nothing but good old fashioned teamwork.
Chal taking on two Incaroses simultaneously and winning. Also for Peridox and Pyrox, who blast one with Pyrox's Soma to help their captain....after being stabbed through the heart.
Shing stabbing himself in the foot so he can hold on to Kohaku as Gardenia tries to suck them all in. Holy. Shit. Now, that is true love!