Reliable and strong lane harass with strong ramping teamfight/all-in damage.
Empowered abilities and resource manipulation
Hitting a champion with spells hurls a comet that deals adaptive damage at them. Landing more spells reduces Arcane Comet's cooldown.
Hitting enemy champions with a spell grants maximum mana.
After reaching 250 mana, Manaflow Band restores 1% of your missing mana every 5 seconds.
Gain 3% extra MS. Gain extra AP or AD, based on your bonus MS, Adaptive.
Your first ability hit every 20s burns champions.
+65 health and +10 AP or +6 AD, adaptive
After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Restore health over time based on your missing health.
Kassadin's strong slows on [E] makes Comet incredibly reliable to land for that extra lane harass damage.
Manaflow Band empowers your ability to harass in the early game laning phase with constant [Q] poke. The additional mana pool in the mid-game should grant you a few more [R] casts.
Celerity on Kassadin allows you to keep up with and stick to your opponent when you're running them down in an all-in.
Scorch is a rune that, like Aery, is very strong and reliable during lane. These two combined make for a strong poking tool with [Q].
If you're looking to scale into a longer game rather than harass in lane, Gathering Storm is a decent option here.
Bone Plating's early game mitigation is fantastic for absorbing damage and helping you get through your weak early game so that you're able to scaling into a strong mid-game and take over.
Second Wind's reliable health sustain further empowers your ability to sustain in tough lane match-ups so that you're able to scale into the mid-game.