Playing around with practice tool as Zed vs intermediate Rammus bot to test armor pen..
This was my build

My runes were lethality reds and quints, m keystone was thunderlords. I had roughly 80ish lethality level 18.
This was
Bot full build
and I think another armor item, don't remember it very well.
I ulted him, blew my entire combo on him, killed him with another auto amd spell afte death mark popped.
Idk if it's the items being overtuned to give me a build that shreds squishies and tanks or something else.
I didnt have infernal drakes, baron, or infinite cds on.