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Clarification: Partially Limited Powers and ECs


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Clarification: Partially Limited Powers and ECs


Steve, need to make sure I understand this one from FAQs.


EC (20 Pts)

Slot A - 40 AP : (8d6 EB) : 20 RC

Slot B - 40 AP : (8d6 EB) : 16 RC

---------- Partially Limited Power

::::::::::: 15 AP : (3d6 EB) : 15 - 5 = 10 RC

x2 END : 10 AP : (2d6 EB) : 10 - 5 = 5 * -1/2 = 3 RC

x3 END : 10 AP : (2d6 EB) : 10 - 5 = 5 * -1 = 2 RC

x4 END : 5 AP : (1d6 EB) : 5 - 5 = 0 = 1 RC



Is this correct? Or am I missing something?

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It's close...but not quite there.


Each power in a compound power is reduced proportionally to its active points.


In your example, you have 20 points of total reduction to deal with from the EC. You have 40 total Active Points of Powers in your compound power (or partially limited power -- same thing). So far, so good.


Power 1 has 15 AP. 15/40 = 3/8. (3/8)*20 = 7.5 AP (effective)


Power 2 has 10 AP. 10/40 = 1/4. (1/4)*20 = 5 AP (effective)


Power 3 has 10 AP. 10/40 = 1/4. (1/4)*20 = 5 AP (effective)


Power 4 has 5 AP. 5/40 = 1/8. (1/8)*20 = 2.5 AP (effective)



Now we apply Limitations:


Power 1 = 7.5 AP = 7.5 RC

Power 2 = 5 AP / (1+.5) = 5/1.5 = 3.3 RC

Power 3 = 5 AP / (1+1) = 5/2 = 2.5 RC

Power 4 = 2 AP / (1+1.5) = 2.5/2.5 = 1 RC


Add these up, and your total Real Cost for the slot is 14 points.


Note that this entire process is considered one "calculation", so rounding only occurs at the end. The 'effective active" is not a calculation in itself, as you're not calculating the active points, you're just doing the first part of the single calculation to determine the portion of the discount that the ability will get from the EC.

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To simply verbalize the rules on this (which I should have done originally):



The Compound Power that we're dealing with

An individual component of the CP

Effect Active Cost
The Active Cost of the part after it is adjusted by subtracting the EC discount


For each part of the CP, you need to calculate the percentage of the overall discount from the EC to apply. This percentage is determined by the ratio of the part's Active Points to the overall Active Points of the CP. For example:


EC value/"discount": 20

Total AP of the CP: 40

AP for a given part: 15


15/40 = 3/8


3/8 * 20 = 7.5 = discount for this part.


15 - 7.5 = 7.5 = effective active cost for this part


If the "discount" for a given part is greater than one half of the Active Cost of that part, then you adjust the effective active cost to be equal to the discount. In other words, the following must always hold true:


effective active cost >= discount*2


Once you have determined the effective active cost for each part of the CP, you apply the limitations to each part's effective active cost (rounding rules apply here). This gives you the real cost for each part.


Add together the real costs of each part, and you will get the total real cost for the CP.

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The reason (or at least part of it) for all of the complexity is that the reduction in cost from an EC is taken from the Active Cost of a slot (before Limitations are applied).


When you're dealing with a Compound Power, where the Limitations and Active Costs of each part vary, you need to "balance" things in such a way that the overall reduction in cost is inline with what the EC should provide and each individual part of the Compound Power is reduced in proportion to its Active Cost.


Because this reduction in cost is based on the Active Cost (not the Real Cost) of each part and is performed before Limitations are applied (just like with any other slot), things become a bit complicated.


Toss onto that the basic rule that you cannot reduce a slot to an Active Cost which is less than the Active Cost of the EC itself, and you get even more complexity.


Trust me, it was a royal pain in the arse to code in ;-)

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