How much mana will "Reduced Mana reserved" reduce from Spells that reserve Mana?
Here is what I mean: An Example is Sovereignty: Putting points into it nets you 14% reduced mana reserved.
Let's say we have 10% reduced mana reserved
When you cast Purity of Lightning: Which reserves 40% mana.
By how much will it reduce the reservation?
- by -10% additive result: 30% mana reserved
- by -10% multiplicative result: 36% mana reserved
Incase it was additive: How does it work with a second aura? Let's say #2 is 20% mana reservation
- -10% of 40%: 30% mana, and 20% from the other, result: 50% mana reserved
- -10% of 40%: 30% mana, and -10% of 20%: 10% mana, result: 40% mana reserved
1 Answer
Reduced mana reserved can be tricky. You can try out this Reduced Mana Reserved Calculator to get a better understanding of how the math is applied.
In short, it takes the amount of mana set to be reserved (10% of your total) and chips away a subpercentage. But some things might not be as you would expect.
Here is a practical example:
4I have 41% reduced mana reserved passives from the tree. I have a lvl 17 reduced mana gem, which gives me a 0.74 mana multiplier on the reservation. I want to know the exact calculation how much percentage a 60% and 40% is going to reserve.
So far i expected it to be: 60% * 0.59 * 0.74 = 26.196, which seems to be wrong.
I checked the source code of the mana reservation site linked before:
There, you can see that they first multiply the aura reservation with the mana multiplier of the gem and then round down:
60%*0.74=44.4% -> 44% reserved 40%*0.74=29.6% -> 29% reserved
Then this reservation is multiplied with the passives and rounded up:
44%*0.59=25.96% -> 26% reserved 29%*0.59=17.11 -> 18% reserved
This seems to be the correct calculation.
Assuming this is correct, it is funny, because you actually need a level 20 reduced mana and at least 0.41% reduced mana reservation passives to rock four 60% auras on mana, which is exactly what I hope to achieve.
