User blog comment:Megames1/Against the Meta- Xerath, and More!!/@comment-5170841-20121021113625

Renekton damage falls off late game because the are only few ad item he can truly use or synergize with.

My friends and i actually fixed this problem by focusing on building tanky first rather than damage, which comes late game. By getting sunfire, warmogs and FoN for the most part of the game we can stick to the enemy carries long enough to deal a hefty amount damage and leave the rest to allies who are better suited to dealing damage. Once finished with the tanky items renekton becomes seriously unkillable as this opens up the oppurtnity to build B.T. giving renekton the suprising late game damage he so desparately needs. We usually finish of the build with cleavers, IE or mallet.

This wouldn't hold true for season 3 though as Riot stated they made provide better itemezations for ad based characters like renekton, riven, lee sin, talon and urgot. The item in the new twitsted tree called the Lord Van Damm's Pillager (http://leagueoflegends.wikia.com/wiki/Lord_Van_Damm%27s_Pillager) could be a for taste of whats to come