Passive Tree notable "Mental Toughness" does not work + proof

As title states, the Passive tree Notable "Mental Toughness" does not function according to its tooltip, which states:


The mana regeneration is working as stated, the mana cost reduction does not function either in game or cosmetically. I have tested this both by allocating the node on the passive, and by anointing it on the amulet. All testing was done with the node active, and not allocated to a weapon skill point, to ensure that it should always be active. The mana regen was active and functioning through all testing.

To test this, I used Sigil of Power, which gains a stage when 50% of the player's maximum mana has been spent while inside of the Sigil's radius. My maximum mana while testing was 3978, so at 1989 mana spent it will gain a stage. The current stage of the buff is visible as a buff at the top of the screen, so this makes it easy to track mana expenditure.

The mana cost of the spell I tested with, spark, was 239 mana. It should take 8.32 casts to reach this, so on the 9th cast the buff will tick from 1 to 2 stages. This was successfully tested and confirmed. With the 15% cost reduction from Mental Toughness, my mana cost should be 203-204 (level 26 spark has a base cost of 135, I am running 2 120% mana cost multiplier support gems with inspiration for a 40% less mana cost multiplier, this comes out to 239 mana, 15% of this is 36, give or take 1 mana for in game rounding. I also tested this using "Deep Trance" for 10% mana cost reduction, which reduced my mana cost to 215 as expected.)

This means that it should take 9.79 casts to go from stage 1-2 on a fresh Sigil of Power, so 10 full casts. With Mental Toughness allocated, and starting every cast on full mana to make absolute sure that the notable's conditional was met, the sigil would gain a stage on the 9th cast with 100% consistency, meaning the test failed every iteration.

I then refunded/unspecced Mental Toughness, and took "Deep Trance" which gives 10% skill cost reduction. This took my tooltip mana cost to 215 as expected (Mental Toughness also does not reflect in any tooltips). At 215, it should take 9.25 casts, so 10 in game. In every test iteration, the sigil went from stage 1-2 on the 10th cast, confirming that the mana reduction from Deep Trance is working as intended while Mental Toughness does not.

I attempted a number of ways to find if the conditional was bugged, but nothing that I did seemed to activated it, including being on full/not full but not low/low mana, and the same for Energy Shield and life.

Yes I can confirm this is a bugged notable! The "reduced mana costs" part of the skill does not work AT ALL! Even when anointed onto necklaces/amulets!

GGG plz fix and see this as people are wasting points and exalts trying to use this good notable but its currently a waste! D:

it's because of the keystone CI, it count you as being both full and low life at the same time, same for mana both full and low at the same time...it's messed up you can annoint deep trance as an alternative it's still 10 reduced cost of skills..

"

Yahim05#3213 wrote:

it's because of the keystone CI, it count you as being both full and low life at the same time, same for mana both full and low at the same time...it's messed up you can annoint deep trance as an alternative it's still 10 reduced cost of skills..

Hah this is true. I tried to unspec my CI and my mana cost goes down. I wonder if this is bugged or this is the intended interaction????