I'd rather warden's mail reduce attack damage by 15% than attack speed by 15%
even if it would strictly be more powerful (because means ad scaling abilities would do less damage)
I don't see people building randuins omen except vs Trynd and Yasuo. The item is a bit too niche tbh, most marksmen don't even stack enough crit to make randuins worth it. If the item were more directed towards reducing ad, it would be really great vs assassins like zed and talon.
besides, having your attack speed gimped feels more frustrating to play against than having your attack damage reduced because it mucks with the timing of animation cancelling if you are trying to orb-walk.
#Warden's mail

Components:

Combine cost: 400 gold
Total cost 1000 gold
+40 armor Unique -- Deflection: If you take physical damage from an enemy champion, their attack damage is reduced by 10% for 1 second.
#Randuins Omen

Components:

Combine cost: 900 gold
Total cost: 2900 gold
+500 health +60 armor Unique -- Deflection: If you take physical damage from an enemy champion, their attack damage is reduced by 15% for 4 seconds. Unique Active: Slows all nearby units within 500 range by 35% for 4 seconds (60 second cooldown)
#Frozen Heart

Components:

Combine cost: 800 gold
Total cost: 2800 gold
+90 armor +400 mana +20% cooldown reduction Unique Aura: Reduces the attack damage of all nearby enemies by 10% (700 range)

