New Runes And Karthus

piX BluX·Nov 13, 2017·1 votes·2,082 views

I dont know why this happens but if you go cdr runes on new rune system with karthus taking Cosmic Insight with The Ultimate Hat allowing you to get 60% cdr on your ultimate (Requiem). The base cdr for karthus ult is 160 seconds rank 3 and with the 60% cdr your ult goes to around a 74 second cooldown which is incorrect as shouldn't it be a flat 64 second cooldown which is confusing. i found this through the practice tool but dont know if this happens in online games EDIT: i now know that the way the runes works The Ultimate Hat takes away 15% cdr then the other 45% is taken from what is left but is that how it was intended?

2 Comments

EarthyMadnessNov 13, 20173 votes

The math is actually right. While yes, 60% CDR would result in a 64s cooldown, we don't have 60% cdr.

The Ultimate Hat is not stackable cdr, it's a unique cdr only for ultimates. So, what you have is 45% CDR on 160, which reults in 88. This is our new "base". The Ultimate Hat now reduces our "base" by an additional 15%, which results in 74.8s. Math is below.

160x0.55 = 88 [Reduced 45%] 88x0.85 = 74.8 [Reduced 15%]

WonderPaolNov 23, 20171 votes

Can confirm: Did a check on Practice Tool with ya boi TahmKench

Comparison 0% cooldown VS. "60%" cooldown: https://i.imgur.com/aF6sF8Q.jpg

The base cooldown of 100 seconds is 100% (no reduction) Reduced: The cooldown is now 46.75 seconds, being 46.75%

100% - 46.75% = 53.25 % cdr (not 60%) item 3070

Fun fact: Zilean 's base cooldown on "Chronoshift" at lvl 3 is 60 seconds. Reducing this by 53.25% puts it at 28.05 Seconds. Combined with a Guardian Angel, this lets Zilean revive himself (or more commonly, his adc) up to 3 times per teamfight. -Sincerely, a Tank Zilean main item 3158 item 3107 item 2301 item 3109 item 3075 ( item 3190 / item 3742 )