Here is your true black cleaver fix

30% BASE AD 100% HP regen 20% CDR 500 HP Unique passive: Rage movement speed Unique passive: Armor Shred

This would make it scale better late game for juggernauts and fighters that it was intended for, whilst being absolutely shit for AD carries / Assassins at every stage of the game.

Let's be real here the 30% base ad is kinda shitty early but the hp regen and added hp is supposed to make up for that and helps make it scale better late too. 30% base ad is like 40 ad for most juggernauts come late game, in return they get more beefy as compensation for the weaker early ad which is fine considering they excel in extended fights anyway.

for every current abuser these changes are a nightmare since they can't get good value out of the 30% base ad at any stage of the game. And their abilities scale with bonus ad so it would wreck their burst damage. They also cannot make good use out of the hp regen which is added as compensation to make up for the loss of early AD. The only useful thing they could get out of it is the added hp they don't need or want to do their jobs.