Can we look at reworking Black Cleaver into a solo damage-booster instead of an Armor-Shredder?
Considering the fact that Armor-Shred and Penetration applies BEFORE lethality, essentially cancelling out the "fall off" of things like
by cutting through a whole quarter of the armor that was built to counter these "early game items that fall off late game?"
Think about it:
is one of the core picks for Bruisers, and yet it's amazingly more effective on Assassins because it makes it so every single one of them can scale well into 40+ minute games before they see any sort of fall-off due to the ridiculous pseudo True-Damage they deal from all the penetration they get on their near impossible to miss point and click "combos" which will all be reduced in cooldown by the full 40% because every one of them religiously buys
every single game.
Make it like
's effect, only instead of the user getting a damage increase over time in combat with champions the user's damage increases from stacks on the target granted on every unique source of physical damage. So this way if an assassin want's to deal with heavy armor they HAVE TO BUY
or
instead of getting everything they could possibly want with 
This way Bruisers still get the damage increase they want in order to function the same while Assassins can't abuse the broken penetration mechanics with Cleaver to counter the fall off they're designed to have.
[Palette swap to red]
+25 AD
Unique Passive - Sunder: Dealing physical damage to champions, epic monster, or structures, Sunders them. Sunder reduces the target's armor by 3% for 6 seconds and can stack up to 10 times for a maximum of 30%. [This is a named passive, and a single champion owning multiple Sunder items would only benefit from one passive. However, a target could be Sunderd by multiple separate champions having Sunder items. Compared to current Black Cleaver, this stacks up to more times (10 instead of 6) but shreds less with each stack (3% instead of 4%). The idea is that with % armor pen unified into cleaving, you will have multiple allies (ie., marksman + fighter) working together to apply shredding on a tank in teamfights, therefore the upper limit is increased to incentivize this teamwork.]
)
+35 AD
+25% Attack Speed
Unique Passive: Gain + 5% Attack Speed for each basic attack against champions, epic monsters, or structures, stacking up to 5 times for a total of +25% Attack Speed.
Unique Passive - Executioner: ... [Same as current.]
(
+
)
+400 Health
+75% Base AD as Bonus AD
+10% Cooldown Reduction
Unique Passive - Sunder: ... [Identical to listed above.]
Unique Passive - Rage: ... [Same as current.]
[This is the replacement for current Black Cleaver.]
)
+80 AD
+100% Health Regen
Unique Passive - Sunder: ... [Identical to listed above.]
Unique Passive - Cleave: ... [Same version as on Tiamat.]
Unique Active - Crescent: Deals 30% to 50% of total Attack Damage as physical damage to nearby enemy units (enemies closest to the target take the most damage). This effect applies 3 times over 3 seconds (10 second cooldown).
[This item would be very useful for applying many stacks of Sunder in a teamfight. It would be an alternative to
+