Well, a while back I was trying to break the meta for supports, and look what I found. I know what your thinking but it does work, try it if you don't believe me.

Anyway, I was looking around and there aren't any builds for support malphite (I wonder why?)

so here is the step by step guide of how to do it

For your first two items you should either build into the targons brace or start getting a sight stone, it all depends on the situations, if you find your having to use alot of wards cause there jungler is camping bot lane then get the sightstone and not the targons dumbass :P jk however if your finding that your too low on health get a targons.

Finish off you face or the ruby sightsone and also change to a sweeping lens

So, if you wanna deal some extra damage get the rylais cause obviously malphite is ability power and it gives you extra health too, however if you wanna help the rest of your team you should probably go for the aegis

if everythings equal, go for mobility boots...

if your losing go for the merc treads or ninja tabi to give you a bit of an edge...

if your winning go for sorc shoes to give you that little extra damage...

simple

If they're AP go spirit visage,
If they're AD go warmogs,

very situational as to who the biggest threat on the enemies team is

get either the spirit visage or the warmogs dependant on what you got for your fifth item or get an abyssal scepter to help your teams damage

Get a captain enchantment on your boots to increase team movement speed and also finish off your trinket