Explain this Mana reserved calculation

I have all Mana reserve reduction nodes [50% mana reserve reduction]
I also have the Blood Magic/Mortal conviction nodes [40% mana reserve reduction]

Now I would assume that it is 90% total.

therefore a 60% -> 6%, 40% ->4%

BUT in reality, the Mana reserves are
60% -> 20%
40% -> 13%

Which is 66% reduction.


OK Lets say 50% from mana nodes first, and then multiplicative with Mortal Convictions "40% Less mana reserved"

That's still
60% -0.50-> 30% --0.40--> 12%

But again in reality, the number it gives me is
60% -> 20%
40% -> 13%

I can't find anyway to back calculate 0.50 and 0.40 to equal 0.33.

Mortal conviction is not 'reduced' but 'less', so is multiplicative. The game always rounds down, but since it calculates the amount removed from reservation it is effectively rounding up.

All 'reduced' nodes give you 46% reduction, and mortal grants you 40% less so:
60% * 0,54 * 0,6 = 19,44 ~ 20%
40% * 0,54 * 0,6 = 12,96 ~ 13%

If you use reduced mana gem its multiplier is applied first and rounded down.

Thanks for the response,

I see where I misread a node and the error in my calculations.