Originally Posted by kavinh the third
because the item as a whole is insanely overpowered. and with multiple black cleavers the armor reduction does stack it's jsut limited to 4 stacks meaning 30% armor off. having 30% armor reduction along with 60 armor pen and 200 ad is borderline op, not to mention the item also grants a healthy amount of hp.
I have yet to see ANY math for "Black Cleaver is overpowered."
Frozen Heart, even with the nerf, still provides a net gain of armor against 60 armor pen flat and 30% armor pen.
90 - 27 = 63. You gained 3 armor, if this was your ONLY armor item. Add in a Randuin's Omen, and you're gaining a decent chunk of heath with more armor. Combined they even slow an enemy's attack speed by 36%, meaning improved damage reduction. Suddenly, you're not doing so badly in the survival department, and this even opens you up for Atma's Impaler, which is MORE armor. Throw on a Frozen Mallet for more health and a perma-slow, and you're golden.