Hello, just sharing this broken build to abuse in late game. Please note that this is playing as aggressive as you can "but" while farming almost perfectly.

Assuming that you have played Renekton a few times, you want to farm to farm ( gold & experience ) and gain fury. Don't completely kill the wave and let your fury decay. When enemy farms and you have 50% of fury or more you go all in and retreat, basically winning all trades.

With long range enemies, take Dorian's Shield as it's hard to have sustain otherwise early game. Hide in bushes and dodge all/most skills from them. Bait them with 50% health or less to give them a sense of "courage" and give them a combo that will make them play passively.

Don't waist fury on minions if it allows the enemy to trade with you.

Renekton's Passive - Renekton gains 5 fury per autoattack. When out of combat for 12 seconds, he loses 4 fury every second. gWhen Renekton is below 50% health he generates 50% more fury from all sources.

Renekton's Cull the Meek Renekton - Renekton swings his blade, dealing 65 / 100 / 135 / 170 / 205 (+0.8 per bonus attack damage) physical damage and restoring 2 / 3 / 4 / 5 / 6 (+0.02 per bonus attack damage) health per non-champion and 10 / 14 / 18 / 22 / 26 (+0.15 per bonus attack damage) health per champion hit (capped at 50 / 75 / 100 / 125 / 150 health). He also generates 2.5 Fury per non-champion and 10 Fury per champion (max 30 Fury).

Fury Bonus: Damage is increased to 100 / 150 / 200 / 250 / 300 (+1.2 per bonus attack damage) physical damage and healing is increased to 6 / 9 / 12 / 15 / 18 (+0.06 per bonus attack damage) health against non-champions and 30 / 42 / 54 / 66 / 78 (+0.45 per bonus attack damage) health against champions (capped at 200 / 300 / 400 / 500 / 600 health). Does not generate any Fury.

Renekton's Ruthless Predator Renekton - Renekton's next attack strikes twice, stunning for 0.75 seconds and dealing a total of 10 / 40 / 70 / 100 / 130 (+1.5 per attack damage) physical damage. Hitting a champion generates an additonal 10 Fury.

Fury Bonus: Renekton attacks 3 times instead, destroying shields before dealing 15 / 60 / 105 / 150 / 195 (+2.25 per attack damage) physical damage and stunning for 1.5 seconds. Does not generate additional Fury.

Renekton's Slice and Dice Renekton - Renekton dashes, dealing 40 / 70 / 100 / 130 / 160 (+0.9 per bonus attack damage) physical damage. He generates 2 Fury per non-champion and 10 Fury per champion hit. Hitting at least one enemy allows Renekton to recast this ability once for 4 seconds.

Fury Bonus: The recast dash deals 70 / 115 / 160 / 205 / 250 (+1.35 per bonus attack damage) physical damage instead and removes 25 / 27.5 / 30 / 32.5 / 35% of the target's armor for 4 seconds. Does not generate Fury.

Renekton's Dominus - Renekton surrounds himself with dark energies for 15 seconds, gaining 250 / 400 / 550 max health and 20 Fury. While active, he deals 750 / 1500 / 2250 (+150% of ability power) (+1.5 per bonus attack damage) magic damage and gains 75 Fury over the duration.

Yup, as you play him, you will find out sometimes this doesn't work because the whole enemy team is fed. One really can't do anything, no point in flaming. Also, ignore the team... but help with objectives. If they are in a tight spot, try to help without dying. It's better for 1 to die than 2, 3, so on. So keep that in mind.

You will basically become Nasus but with stuns and dashes. Try to use them as a gap closer and evasion mechanisim. Most importantly, practice makes perfect.

You want to become like Faker, Rookie, Rekkles, Chovy? Heck me too, but remember that they didn't magically wake up one day and became OP. It's not talent either ( I would assume ), but practice. So check this out and let me know what you think.

PS: I went from PTA to this build after trying it 3 times.