F-Smash is Byleth's slowest Smash attack, but also has the most range and KO power. When charged, it's KO power is the strongest of any move Byleth has. This move is strongest when angled upwards, and weakest when angled downward. However, even when angled downwards, it still has considerable strength and is still the earliest KO-ing move Byleth has. This is her best shieldbreak punish at around 25%.
Due to it's range, it can be used to cover multiple getup options from ledge, or used to cover multiple or sometimes even all options on a techchase.
F-Smash can never be comboed into, but can be used as an airdodge read. Like all smash attacks, it cannot start combos.