+180 Ability Power
+400 Max Mana
+8% Movement Speed
Decreases target armor by 50 on hit for 5 seconds. Stacks up to 5 times.
Recommended for frontliners and heroes with skills that can deal damage several times in succession likes of Ryoma, Zephys, Lu Bu, Ormarr. Can be used with marksmen when the enemy team is physical damage focused.
It will give you some survivability and much-needed armor piercing. Also, 15% of cooldown reduction is the most you can get from the attack damage item.