berserker's greaves - for proccing your passive faster on enemy groups. substitute with ionian boots if you find yourself in solo fights more. CDR boots help get your passive more.
sightstone - synergizes great with lux's E because you can never have too much map vision and give good health to further synergize with atma. upgrade to ruby sightstone if you have an early gold advantage.
atma's impaler - as i said, this item is your ticket to damage from all the health you build. with an 18% crit chance and the loads of AD gained from all your health, you'll be farming champs in to time.
runic bulwark - works great with her double shield allowing her team to take less overall damage while the shield is up thus increasing it's effectiveness. gives health for a nice bonus for atma's.
maw of malmortius - an awesome item for any character laning against a mage. built with your runic bulwark, you're deceptively tanky from your added MR with a shield on top and almost impossible to burst down due to its passive. the added attack damage works wonders while proccing your passive. also, you gain AD from the more daamge you take and since you're becoming really tanky, you can make good use of this longer than most.
guardian angle - because why not? even more defense, inexpensive, and because since you'll be spending most of your time autoattacking, you'll need the added defense to survive longer.
let me now how this works for you. i'll write a guide for this soon and post it on solomid.
My Mom ;_; - http://www.gamefaqs.com/users/Anbu_Panda/boards My Dad - http://www.gamefaqs.com/users/DarkestPanda/boards