If I would use them, then I'd go for Flat CDR ones, as this would strenghten
Renekton's early-game; allowing him to snowball. I personally prefer 6 flat ones and 3 flat/scaling mres glyphs but you can use more if you want.
The scaling ones are okay, mostly because it's tough for Renek to get CDR at all, but I don't think they're worth it on him. They outscale at level 9 compared to the flat ones and Renekton isn't a late-game pick.

The scaling ones are okay, mostly because it's tough for Renek to get CDR at all, but I don't think they're worth it on him. They outscale at level 9 compared to the flat ones and Renekton isn't a late-game pick.

9 flat CDR glyphs are really good on Renekton. He's very strong with his abilities available and pretty ignorable when they're on cooldown. You might want to take flat MR against some magic top laners like
Rumble and
Ryze.
CDR quints aren't worth it. Take AD quints instead and you'll get more out of your cooldowns and autoattacks early game.


CDR quints aren't worth it. Take AD quints instead and you'll get more out of your cooldowns and autoattacks early game.

Thanks to Jovy for the sig!
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I've been wondering if I should try some cooldown reduction runes on Renekton.
Though I can't figure out if it should be;
Flat Glyphs
Scaling Glyphs
Flat Quints
Scaling Quints
Do you think it's actually worth it? And how many should I stack?