Sunfire Cape

Abyssal Mask

Iceborn Gauntlet

Locket of the Iron Solari

Warmog's Armor

Thornmail

Gargoyle Stoneplate

Adaptive Helm

Frozen Heart

Mercury's Treads

Ninja Tabi

Sunfire Cape is a great early game item against AD matchups. Gives HP, armor, and extra damage. I take either this or iceborn gauntlet, depending on the lane.Abyssal Mask is always the first item you're going to want to build against AP lanes. Gives health, mana, and most importantly, magic resist.Iceborne gauntlet is good in lanes that you're going to be trading a lot because it gives armor, mana, extra damage, and an AOE slow. I either take this first or second item against AD heavy teams.Take this second item against heavy MR teams, as it can be upgraded at level 12 to give even more magic resist. The active on this item is also very useful in team fights and could be the difference on whether or not your ADC survives.Warmog's is a very good item on Ornn as it allows him to not ever need to back for health. The only reason Ornn would need to back with this item is to reset his position or get mana back. I usually take this after completing my second masterwork item.Thornmail is a great item against teams that are heavy AD, as it gives tons of armor and makes them take damage when you're auto attacked. As an added bonus, it gives grievous wounds to lower enemy healing.Gargoyle Stoneplate is definitely one of my favorite items on Ornn, and it isn't for the active, but for the passive. With 3 or more nearby enemy champions, Ornn gains 40armor, which brings his bonus armor and magic resist from Gargoyle up to 80 each! Plus for only 2500 gold this is a great deal. Ornn is a teamfighting champion, which is what makes this item so good on him.This item is great against any AP champion that deals damage over time. I'm talking about Teemo, Singed, Brand, Malzahar, and others. For sure build this if you're going against a Teemo.Tons of armor and mana, great against high attack-speed champions. Not much else to say, but if you're going against a fed ADC I'd recommend this item. Maybe even pair it withSometimes I even take these against AD matchups if the opposing team has a lot of hard CC. Otherwise, I take these only against AP matchups.I take ninja tabi against almost all AD matchups. No need to rush these if the person you're facing doesn't auto-attack very much.