[Gameplay] AP Math Isn't Adding Up for Cassiopeia Passive - With Pictures!

The Gryphon·Dec 10, 2014·1 votes·1,647 views

Hello, I just recently played a game as Cassiopeia and I noticed that the tooltip for her passive was a little unclear. It gave percentages of AP and then at the bottom gave the exact AP bonus amount. Unfortunately, these didn't match up.

In the attached photo, I had 690 AP and full 500 stacks of my passive. The passive said I was receiving 30% bonus AP, and it claimed that this was 116.71.

Assuming the passive does not stack with its own AP, it should give a bonus equal to .30*(690-116.71). This number would be 171.987, so the bonus is too low.

Not only that, but Rabadon's Deathcap, which also claims to grant 30% bonus AP, has a tooltip claiming that 30% is 159. Both the passive and the deathcap claim to give 30%, but they are two different numbers, and I can't figure out where Cass's passive is getting its result.

11 Comments

B3ERDec 10, 20142 votes

Seems like a problem. Good catch. Also, screenshot is a thing.

The GryphonDec 10, 20141 votes

I tried taking screenshots and for some reason they kept coming up as just big black screens. I didn't want to take too much time to resolve that while in mid-game so I just whipped out my phone.

Duke AnaxDec 10, 20142 votes

They stack of of each other and with masteries

Items: 320 Runes: 9,7 Masteries 6 + 16 x 0,89 = 20,24 Flat AP 350

Masteries: 350 * 1,05 = 350 + 17 = 367 Dragon: 367 x 1,06 = 367 + 22 = 389 Passive: 389 x 1,3 = 389 + 117 = 506 Mysterious 5%: 506 x 1,05 = 506 + 25 = 531 Rabadons: 531 x 1,3 = 531 + 159 = 690

edit: dissected flat values, moved masteries modifier and adjusted dragon ratio.

The GryphonDec 10, 20141 votes

This is post-patch, so dragon should only have given 6%, so that might be a different bug entirely. Also, you started at 360 but those items only add up to 320 if the ROA is full. Where did the other 40 come from (since you accounted for masteries and stuff later)?

Duke AnaxDec 10, 20141 votes

Ok I adjusted the calculation a bit, if masteries put dogether and dragon adjusted, then everything up to the passive works out, but then there is a 5% modifier missing to the base for the Deathcap value.

ExHentaiDec 10, 20141 votes

Radoobies is applied last

690-159=531 531*0.3 = 159.3

Seems about right.

Now as for Cass's multiplier, that is probably applied someplace with dragon buff or the archmage mastery (I'm too lazy to do the math).

Edit: decided to do the math (9.7+.89*16+120+120+80)*1.05*1.06*0.3=116.84... 116.71 is possible if that rod of ages can give some wacky amount like 79.6 when not fully stacked. Does ROA give some fraction of AP per increment of time rather than a flat amount per minute?

The GryphonDec 10, 20141 votes

That's good math but I am not sure where you got all your base numbers. I should have posted all the runes/masteries I use, but I know I don't have pure AP ones. I'm mostly hoping that someone else can recreate it with their own builds and such to see if it replicates. I'm hoping to look at the math itself rather than my own specific case.

B3ERDec 11, 20141 votes

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