Justice Lantern Ring Doesn't apply it's power to Wizards

Bug Report
1

The Ring Item called (Justice Lantern) is supposed to apply a power that grants: Gain Damage Reduction equal to ( % ) of your Block Chance.
The item itself applies a base Block Chance of at least 12% meaning: If the % Damage Reduction says 50% or more… I should receive at least 6% Damage Reduction automatically as the item grants 12% block chance… however; testing this item on a Wizard with 69.43% Damage Reduction should apply an additional 6% to equal 75.43% Damage Reduction. Equipping the Item doesn’t apply any affect whatsoever.
When using the Delsere’s Magnum Opus Set: 4 piece bonus says: You take 75% reduced damage while you have a Slow Time active… This skill also doesn’t affect the character sheet Damage Reduction application as my 69.43% remains the same…

The only way I’ve been able to increase the Damage Reduction amount is by applying Armor to gear which btw has gone up to 88% Damage reduction decked out in Ancient gear all with Maximum Armor mods… so I’m confused as to why certain attributes are not applying.

2

This is NOT a bug.

You are adding 6% Damage Reduction to 69.43% Damage Reduction to get 75.43% Damage Reduction. But, that is NOT how it works.

D3 Damage Reduction is multiplicative.

Diablo III: Reaper of Souls Math Formulas - Damage Reduction

    1 - [(1 - DR1) x (1 - DR2) x (1 - DR3) x (1 - DR4)]

Example:

You have 4 sources of Damage Reduction

    DR1 = 25%
    DR2 = 25%
    DR3 = 50%
    DR4 = 40%

First, convert percentages to decimal numbers. The formula will look like this:

    1 - [(1 - 0.25) x (1 - 0.25) x (1 - 0.50) x (1 - 0.40)]

Which becomes:

    1 - (0.75 x 0.75 x 0.50 x 0.60)

And finally:

    1 - 0.17 = 83.13% Damage Reduction

    In your case:

      1 - [(1 - 0.6943) x (1 - 0.06)]
      1 - (0.31 x 0.94)
      1 - 2914 = 7086

    7086 = 70.86% Damage Reduction. Not 75.43%.

6 Likes
3

Don’t you also need a shield to block at all? Wizards don’t use shields in offhand. Without a shield that block chance does nothing.

Slightly offtopic but I really don’t understand why Justice Lantern clutters the loot pool of classes that never use shields.

1 Like
4

Due to game mechanics. May be wizards not use shields but they can wear them.