This is exactly what Renekton needs

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Here is a link to my build's stats: http://lol.fanrealm.net/woz4O2rMacsoJnn9nHoC/#stats

I tried taking out atmog's and putting in bloodthirster and zeke's instead but it just seems to drop my survivablity and damage :/

If I switch warmog's with randuin's, I get the extra 5% to max CDR and gain about 1000physical health but lose about 1000magic health. Is that better because it maxes CDR instead of being at 35%?

Also if i take out atmog's and put in randuin's and lastwhisper, i gain a decent amount of damage, but also lose a decent amount, again maxing CDR with randuin's though. Any of these options seem better? lol

i only get ghostblade because with glyphs and masteries my cdr is about 35% at 18. I will try and change the build a bit and take out atmog's. thanks

He had no reason to downvote, but he is correct. I would suggest looking into a lot of basic items that can work on him for max CDR, ghostblade is only 15%, for max u need 25% more. Zekes is 15% and works decently well on rek, health/as/CDR/lifesteal, not a bad item. Soul shroud is another, 15% CDR and increases your heal from ability. the last one I don't recomend but it's never bad is shuryla's, that is a good item as well. He is also correc that atmas is outdated, I'd drop that and the warmogs, and put a bloodthirster on for Damage. I would also recomend hexdrinker into maw, and your item sequence should follow something like this:

boots x3
wriggles (free wards are nice)
Phage- if you are winning laning phase or going against AD, melee
Hexdrinker- get against an ap champ

of course you would upgrade your boots somewhere in there where the player would feel appropriate, and I'd make them know that you can do ninja/mercurys according to lane and other teams composition

You call this a CDR build and the only item you get is a brutalizer...
Also the build is very generic and atmogs is outdated.