"Relentless Malphite" Runes Build
Glacial Augment causes basic attacks to slow enemies. Used with Iceborn Gauntlet, Malphite can cripple enemies with an active W.
Hextech Flashtraption allows Malphite to blink into combat while Flash is on cooldown, and reduce the cooldown of Hexflash to 10 seconds. This let's Malphite have a steady means to jump out at daring enemies.
Magical Footwear there's something very rewarding about being given a 300 Gold item free of charge without having to leave lane. Additionally, boot builds are less expensive and grant more Movement Speed. Very good for this build design.
Approach Velocity Malphite's Q is an amazing tool for chase. Not only will the disc steal Movement Speed from the target, Approach Velocity buffers this even more by granting Malphite even more Movement Speed toward the targeted enemy. Good chance the enemy isn't escaping.
Resolve as a secondary gives Malphite +145 bonus Health and better potion/elixir potency. This will come in handy, as you may want to invest in Elixir of Iron.
Conditioning is essential as it provides +8 Armor, and increases Armor by 5% after the 10 minute mark. Malphite's W passively increases his Armor by a %, stacked with Conditioning the armor bonuses are insane.
Overgrowth is also essential as it adds .2% of your total Health as bonus Health for every 8 minions that die around you. Malphite's Passive gives him a shield equal to a % of his maximum Health. Overgrowth essentially increases this shield potency through the course of the game.