Black Bruise for tanking?

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Why does it want me to use black bruise as a tank over mithrios?

I can take a look – it might not be adjusting the damage effect value down enough based on the toughness slider.

it might be but even when i turn it to all toughness it wants me on black bruise

cd508c80e12f4140a2ae613b0dd46206 even when I plug in like full BIS with heroic LK it recommends heroic black bruise over heroic mithrios for a warrior