Restore health over time based on your missing health.
Kleptomany is a strong keystone choice on Fiora thanks to her ability to repeatedly proc it with just a [Q]. These repeated procs allow you to take efficient short trades and accelerate your item timings.
Magical Footwear's primary strength is it's raw gold value. Think of it as a free kill at level 10, allowing you to hit your power-spikes super quickly in the mid-game.
Biscuit Delivery is an incredibly strong lane trading rune, especially as fiora, as it will allows you to shrug off any incoming damage while still making ton of gold from Klepto.
Cosmic Insight is an all-around great rune choice on any champion, especially poke champions who are constantly looking to deal damage from range when their abilities come off cooldown.
Bone Plating's early game damage mitigation makes your laning phase trades extremely efficient and profitable when paired with Kleptomancy and Second Wind.
Second Wind's mid-fight health regen is fantastic for staying healthy through your short trades for Klepto procs.