Quote:

**RiotTiza**:

11% more damage is 0.11 CDR scaling. Compare that to Vlad's AP ratios - 0.6 on Q damage, 0.25 on Q heal, 0.45 on E damage, 0.7 on R damage.

CDR isn't useless, but AP scales better in terms of raw damage.

DPS is Damage / time. If you reduce time by 10%, you increase DPS by 11%, BUT that's only if you have no CDR to begin with.

1 Damage / (0.9 * Time) = 1.11 DPS.

CDR scales assymptotically, so the more CDR you have, the more effective additional CDR is (up to the cap). This means that CDR masteries and runes would make that 10% CDR even stronger. For example, say he already has 8% CDR from Enlightenment and Sorcery, an additional 10% CDR increases his total DPS by 12%. If you're going from 30% to 40% CDR, your total DPS increases by 16.7%.

8% CDR -> 18% CDR

(1/0.92) / (1/0.82) = +12.2%

30% CDR -> 40% CDR

(1/0.7) / (1/0.6) = +16.7%

What are Vlad's AP ratios supposed to demonstrate? It sounds like you're trying to compare CDR to AP as though there was a "CDR ratio" on abilities, or as though 1% CDR was valued the same as 1 AP, or as though CDR was equivalent to the bonus damage on abilities, which it simply isn't. CDR getting you additional uses on skills means it scales with BOTH base and bonus damage, and the effectiveness of CDR is nonlinear as I just showed. If you want to demonstrate that CDR is weaker than AP, you need to show that a given amount of gold's worth of CDR is worse than that much gold's worth of AP.

It's absolutely true that AP is better whenever you're using hit-and-run tactics, and it's absolutely true that Spell Vamp can help you sustain better if you're focusing on Tides of Blood over Transfusion, which is why I'm really confused as to why you're taking this argument. Usually when I read guides, I see people avoiding CDR on say, a mid champ, because either the champ's cooldowns are too long to use twice in the same fight, even with CDR, leaving them to focus entirely on burst, or they recognize the power of CDR but plan on getting the CDR from elixirs, masteries, and blue buff (an argument I find somewhat tenuous, but could work in an organized group).