there is another easy solution to the armor pen issue than nerfing lethality again.

give those three items same name passives. ive been saying this for a long time. if this change was done, no matter how you look at the itemization, the buyer would have to make a tradeoff.
- want damage against squishies? stack lethality.
- want damage against heavy armored opponents? buy cleaver or last whisper.
- want to be able to deal some damage against both? its possible, but youll have to miss out on the 20 off ghostblade. it would at least put a more reasonable limit on the stat.
no need for a gigantic game mechanics change and revert the armor pen stacking mechanic to pre season 3. no need to nerf hammer the individual items (maybe edge of the nights active needs to get looked at still).
maybe
could even lose 5 lethality and it could be moved over to
to 25 lethality (adjust item costs) with ths change, to limit the mixed pen build just a slight bit more.

, the armor pen stacker still deals almost true damage to you after % pen/shred and lethality. you lose like 40 armor from the last whisper, and then the rest of your armor from the lethality.