Nullifying Orb Rune, be able to choose to be a Magic or physical shield
https://www.zupimages.net/up/19/24/pcy7.jpg
If I propose this it's because I find that AD champions have a lot more choices for against an AP, too much AP shield, not enough for the opposite :(
And I don't consider the AP shield less valuable because of their DPS either.
Would like to speak with you
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any AD works with that
any AS based champion becomes a murdering machine impossible to burst down for APs (even squishy ADC will be able to 1vs1 AP assassins with that)
this is just a little complain of mine but this item is so broken,it gives a good amount of MR,damage and sustain for a cheap price
pretty niche but AD casters can still build it and sometimes it's really good (ie. engaging a champion reliant on a CC like
or
or blocking
ult)
as well but its passive it's terrible (kinda like 
30 armor + 0,5 per unit killed (more 15 armor ) so it saves us 45 armor. and since we take the example of a level 6, it means that we have barely 1300 HP, chosen to have a shield of 225 or 45 armor with less than 1500 HP, I quickly made my choice, especially since so much armor with so little HP is not very effective