Duskblade.
i wish we could ban items 
UNIQUE Passive: + 18 Lethality
UNIQUE Passive - Blackout: When spotted by an enemy ward, causes a blackout for 8 seconds, revealing invisible traps and revealing / disabling wards (90 second cooldown).
UNIQUE Passive - Nightstalker: After being unseen for at least 1 second, your next basic attack against an enemy champion deals 65 - 320 bonus physical damage and slows them by 99% for 0.25 seconds. Ranged attacks deal 45 - 300 bonus damage instead and do not slow. (Lasts for 5 seconds after being seen by an enemy champion)
i just think it's unfair that every single champion can build duskblade and be op. i mean yes assassins like zed and talon it's really good but graves/caitlyn/jhin/pantheon (every ad champion) can use it aswell + the extra armor penetration makes it filthy to play againts =/