40% magic pen, with 70 AP is somehow 20x more impactful than 35% armor pen with 45AD (equivalent to between 75 AP, btw), or 25% armor pen, 40% reduced healing, regen, lifesteal, spellvamp, and omnivamp, and 45 AD (equivalent to between 75-80AP, btw)? In what fucking world?
From the gold efficiency alone, we get a void staff that is 57.45% gold efficient before its passive, which is worth 72g, per 10 MR of the target, breaking even against targets with over 90 magic resist. A number that requires at least one MR item purchase to obtain for every champion in the game. Even against a 300MR, magic resist stacking tank, its only worth an extra 864g, and will remove 120 MR.
For LDR we have more gold worth of AD, but a slightly higher cost making the item a similar 57% efficacy without its passive, but wait, people tend to have MUCH higher armor values, and armor costs 11.11% more per point of it than magic resist, making armor pen already 1/9th more cost effective per point than MR. LDR's passive is worth 70 gold per 10 armor, even at 35% armor pen (1/8th less pen, but each point penetrated is worth 1/9th more) and as a result, LDR is cost effective against targets with only 88 armor a stat that EVERY tank, and juggernaut gets beyond purely from their base stats alone Do you see the fucking problem? A % armor pen item is already cost effective EVEN IF YOUR TARGETS GET NO ADDITIONAL ARMOR FROM ANY-FUCKING-WHERE, BE IT RUNES, ITEMS, THEIR ABILITIES, OR ALLIES BUFFS The same CANNOT BE SAID FOR ANY OTHER PEN ITEMS IN THE ENTIRE GAME
Against a lategame armor stacking tank, who has between 400-450 armor, LDR removes an astounding 140-157.5 armor, worth a total of 2,800-3150g, WHICH IS AS MUCH OR MORE THAN THE COST OF THE ENTIRE FUCKING ITEM
BUT WAIT! Champions like Malphite and Rammus, actually have %increased armor steroids, and I have seen a Rammus in DBC legitimately get between 800-900 armor at full build (DBC increases armor by 100%, so 400-450 armor = 800-900) at which point that poor son of a bitch is losing between ***5,600-6300 MOTHERFUCKING GOLD WORTH OF ARMOR, WHICH IS WELL OVER FUCKING DOUBLE THE COST OF LDR TO BEGIN WITH, BEFORE FACTORING IN THE EXTRA 45 FUCKING RAW AD IT GIVES, WORTH AN ADDITIONAL OVER 1,500G. NAME TO ME ONE FUCKING OTHER ITEM THAT CAN BE WORTH 7,900G BY ITS SELF***
And here, you have the utter gall to lie straight to everyone's face about a topic you clearly know NOTHING AT FUCKING ALL ABOUT when there is easily accessible information available, where other people such as myself have already done all the maths for you.
and only 
as my mr item.
) didn't have lord dominiks...not even full crit yet.. (all of her damage still came from basic attacking)
has some way to melt through armor (true damage, AAs with incredential damage. %health damage, all of those at once, etc). But even Ezreal has a good deal of magic damage to go through it so yeah. Way too much damage + ADC kits being waaaaaaaaaay too fault-proof against defenses pretty much makes the game one-sided
's in some of those, that gives both Armor and Magic Pen.
