Why do you buy Madreds, Tri-Force and Frozen Mallet?
They're 3 pretty expensive items, and Tri-Force and Mallet dont even synergise well with eachother, because the on-hit slow dont stack. The Madred's wont work well with Renekton either.
You could easily add something tanky or something that atleast would make sense.

I don't build Frozen heart on him? Since you don't know the item names you should come back then.

dudeno sense to buy frozenheart and triforce and madreds -500 elo ?

since you even mention it's far from finished, archive the guide, and unarchive when you are done. for your masteries, get the extra crit DMG since you even got some basic crit. for your item build, im kinda confused about the numbers and the parentheses. you should explain that more thoroughly. consider including a situational items section, and better code this guide while using mobafire's planners to help you with the layout. i look foward to seeing this guide improve.

keep up the good work~

First of all I thank you both for reading this part of the guide :)

As you can see it is far from finished and I just accidentally hit the publish button :(

But I will try to explain the items in the section they're supposed to be in, it should answer a lot of question about why which item etc. I will also add other items because this ofc. is not the way I build him every single match and theres also many items that suit him well besides the selection.

But well thx again for the feedback, makes me to continue right away ;)

really well done build, but then again there is the missing core of renek's playstyle which is brutalizer, this is your bread and butter, i highly recommend you to put it in at least recommended items. wit's end is really good on renek and maw of malmortius too but madred? no, its not worth the price and it won't fit in renek's playstyle

finally, atmogs i always welcomed on renek since you get armor health damage and crit chance which scales well with your trinity force.

i really enjoyed reading this guide and i hope you will continue it :)

i hope this isnt the end? anyways, i like the way your renekton's item looks like except one or two.

About Madred's...

is it rly necessary to get such an expensive item just for Ruthless Predator? At least Trinity Force has many other stats that greatly benefit Renek besides Sheen (such as Movement Speed to chase, Phage proc to slow, occasional auto-attk burst with critical, and attk speed to stack fury faster...). I suggest you remove Madred's Bloodrazor for either Wit's End (AS to stack fury, the magic dmg passive that can stack with Ruthless Predator, PLUS a MR stack that ALSO stack with Ruthless Predator), Wriggle's (get it earlier in the game), or Black Cleaver (DUN DUN DUN self explanatory).

Or you could simply use the money you would have used to make Madred's in order to build FoN (better MR since i see that your renek build lacks it to be tanky...) or Atma's (with all that health, the extra damage you would be granted is something you cannot ignore... and you get to top it all off with a sprinkle of armor and critical strike).

I'm not trying to say that you are wrong. yes Madred's bloodrazor WILL give out amazing dmg onto your opponents, but Wit's End, Black Cleaver, etc deal high damage as well (with cheaper prices). In terms of cost-efficiency, Black Cleaver and Wit's End has an upper hand for Renek.

i gave you a plus one because it is definitely different from other Renek builds I've seen (it focuses more on late-game than early-game it seems?). I am totally going to try out your build. nice job. I hope you can finish the guide any time soon.