Shatterheart is the level 3 Quickening for Fran. The animation is reminiscent of Shiva's summon animation from many games, where Fran appears to encase enemies in ice and then break it with a blow of her kiss.
Fran's Shatterheart Quickening ((咬撃氷狼波, Kōgeki Hyōrōha?, lit. Biting Ice Wolf Wave) is a reference to the Crush Accessory(咬撃氷狼破, Kōgeki Hyōrōha?, lit. Biting Ice Wolf Break) ability from Final Fantasy Tactics. The final kanji for both looks similar, and they're pronounced the same.