Corrupted jewel mana reservation does nothing

I have a corrupted gem for mana reservation


This should give me 12~ free mana but i still have 100% reserved mana instead of 99%.

If i put in a 2% conquerors i get my 24 mana. A conquerors + my corruption i get also only 24 mana instead of 36.

Corrupted + conqueror:

For whatever reason you need to equip 2x 1% reduced mana reservation for it to work. Don't ask me why.... but it's a workaround.

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LtGnar wrote:

For whatever reason you need to equip 2x 1% reduced mana reservation for it to work. Don't ask me why.... but it's a workaround.

Yeah youre right. It seems like all odd numbers for total reduced reserved mana does nothing. So 1/3/5% has no difference between 0/2/4%. Likely a bad calculation that rounds up the reduced percentage of mana reservation. So 1% reduced mana reservation of two auras that reserve 50% each makes it 49.5% + 49.5% reservation, which rounds it up to 50.0% + 50.0% instead of adding them to 90.0 and then doing the conversion which rounds up decimals.

Rounding up the mana reservation reduction like this, making all odd numbers not do anything at all isn't really something that is acceptable when it impacts the calculation in a non trivial way.

I while back I thought it's a bug, but it turns out it's working as intended. Back then I was using Conqueror's Efficiency, but it didn't reduce any mana reserved and then mark1030 said:

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mark1030 wrote:

That’s not how it works. It doesn’t reduce flat mana reservation. It reduces percentage mana reservation on skills that reserve mana. 2% of anything less than 50% will round to zero. It will bring a 50% reservation to 49% though.

I ckecked the wiki and at the bottom of this article in the Reservation calculations section I found how it's calculated and that the value is rounded up.

Here's an example: an aura gem reserves 50% mana, if you reduce mana reserved by 1% it goes to 49.5%, but because the result is rounded up the game still sees it as 50% mana reserved.

You have to reduce mana reserved of 50% aura gems by a multiple of 2% (2,4,6...) to see an effect.

You can also use this calculator.

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bambam wrote:

I while back I thought it's a bug, but it turns out it's working as intended. Back then I was using Conqueror's Efficiency, but it didn't reduce any mana reserved and then mark1030 said:

"

mark1030 wrote:

That’s not how it works. It doesn’t reduce flat mana reservation. It reduces percentage mana reservation on skills that reserve mana. 2% of anything less than 50% will round to zero. It will bring a 50% reservation to 49% though.

I ckecked the wiki and at the bottom of this article in the Reservation calculations section I found how it's calculated and that the value is rounded up.

Here's an example: an aura gem reserves 50% mana, if you reduce mana reserved by 1% it goes to 49.5%, but because the result is rounded up the game still sees it as 50% mana reserved.

You have to reduce mana reserved of 50% aura gems by a multiple of 2% (2,4,6...) to see an effect.

You can also use this calculator.

That is how it currently works it seems yeah. But I don't think its unreasonable to expect a jewel 1% reserve reduction to put your reserved mana to 99% when you have 100% reserved in total though. The rounding is made in the wrong place of the calculation, before adding together the total reserved mana after reduction instead of after. I absolutely consider that to be an error even if it has always been like this. Having half the numbers not mean anything isn't something that is acceptable when this difference actually matters a lot. Unless there is a really good reason for this error to exist of course, but i can't think of a scenario where rounding off the numbers is actually a good thing.