Board Thread:General discussion/@comment-98.245.174.212-20121207231909

Does anyone know if Black Cleaver applies multiple 7.5% stacks? Or steadily building to a single 30%? The math works out differently depending.

A Champion with 200 armor would be reduced to 140 armor to your allies and 108.8 for you with 8% arm pen masteries and sunder mastery and Black Cleaver as a 30% debuff.

200 x 0.7 x 0.92 - 20 = 108.8 total armor computed on your attacks/spells

That same champion would be reduced to 146 for your allies and 114.7 for you if Black Cleaver stacks are multiplicative.

200 x 0.925 x 0.925 x 0.925 x 0.925 x 0.92 - 20 = 114.7 computed against your attacks/spells

As a fun side note, Darius with 3 Black Cleavers, a Last Whisper, and armor pen masteries and Runes against a champion with 500 armor:

500 x 0.75 x 0.7 x 0.65 x 0.92 - (3 x 15 + 5 + 19) = 88 armor computed against your attacks/spells

Tanks, Requiescat in pace. 