2 Item ideas to help cover the gaps

I don't have names for these items, nor will I have exact numbers for most of this stuff because it's all subject to change anyway but here they are.

Anti AD Caster Item

Stats Armor: >=45 Health: >=200 CDR: 10% Passive: When hit by an enemy spell, it causes the cooldowns of the attacker's basic abilities to increase by X% for Y seconds. (effect stacking optional) Build Path: + + "X amount" gold Reasoning: The reason people hate fighting champs like or is because there is no 1 defensive item that's all that good against AD casters, therefore once they start snowballing its hard to stop them. Also would like it to be a 10% CDR item because theres only like a couple 10% armor cdr items.

Anti On-hit

Stats Armor: >=45 Magic Resist: >=45 Passive Option 1: When hit by attacks with on-hit damage effects, lower the attack speed of the attacker by X% for Y seconds (effect stacking optional) Passive Option 2: When hit with on-hit damaging effects, lower the attacker's effectiveness with all on-hit damage by X% for Y seconds (effect stacking optional) Build Path: + + "X amount" gold Reasoning: Devourer is strong because it's pretty difficult to build against it with all the mixed damage it can output. So once again, if a devourer champion starts snowballing it's very difficult to stop them.

Anyway those are my ideas, go ahead and tell me how bad they are below.