Talk:Kennen/@comment-41.232.88.248-20110812141451/@comment-3477331-20110813123132

... extra magic Damage...

That means with 100 Ad, the passive will add 80 Magic Damage to your nest Auto Attack. (The dmg is not combined, so the enemy will take 100 Physical dmg and, directly after that, 80 Magical Dmg.)