I feel like Renata was in a bit of lull and in an awkward postion in terms of items after they removed mythic, which made her feel kinda bad to play, either you had enough tankiness but no mana or damage or you had enough damage and mana but no health. I feel like going Rod of Ages fixes this awkwardness. I'll admit it might not be the "most" optimal item, but it makes her feel nice to play, and it gives her free scaling with stats she enjoys. It also makes it easier to use redeption and play aggressive, because you have more health and are tankier so you can fford to go in. And when you get locket you're even tankier which feels nice. This build also allows you to go ionian boots which are arguable her best boots because of the haste for her w and e and the build makes her tanky enough to where she can afford to go them, and they can utilize the ap and mana ROA gives you. My Op.gg. currently it's not that impressive tbh, but I have a 67% wr with her in normals over 9 games. https://www.op.gg/summoners/na/Athenix-Gay/champions