Idea for new tank items.

Petracite platemail

Not gonna do stats cause that can be worked out by people paid to do so.

Unique passive immolation - targets within x range have their attack damage reduced by 6% per second stacking up to 4 times.

Unique passive stunted - reduces damage dealt by 15% (your own damage, not the enemies)

Helps tanks actually be tanks and takes some mechanics from other games, where tank characters sacrifice a portion of their damage for massive defensive ability.

And finally a mr version.

Noxian breastplate

Unique passive (whatever the abyssal mask one is called) - enemies within range have their ability power reduced by 15% while inside the aura.

Unique passive stunted - same as before.

Both items take passives away that increase a tanks damage (sunfire and abyssal mask) while replacing it with a decent amount of team wide utility and a respectable boost to survivability.

Basically making tanks tanks. Strip some damage from them, increase tankyness.

And due to the stunted passive on these items, other damage focused roles can’t really abuse them due to losing a significant potion of their own damage just buying them.