Restore health over time based on your missing health.
Arcane Comet on Camille is a non-obvious but strong keystone choice for Camille thanks to the high hitrate from the strong slow of [W] and the stun from [E].
Manaflow Band on Camille allows you to repeatedly take trades in lane and out-sustain your opponent thanks to the large heal from [W].
Celerity on Camille allows you to more accurately postiing your [W] mid-cast, chase down fleeing opponents, and gain a small bit of bonus AD while under the Movement Speed effect of Phage.
Scorch is the go-to lane harass rune for getting an early lead in damage so you can keep your opponent in kill-range.
Bone Plating's early game damage mitigation is perfect for Camielle's laning duel playstyle. Look to take trades when its off cooldown.
Second Wind allows you to further enable your early laning trades and synergizes extremely well in lane with Iron Skin. Paired with a Doran's Shield you should be able to sustain heavy amount of poke and harass damage.