[{quoted}](name=Dead flag blues,realm=EUW,application-id=3ErqAdtq,discussion-id=RwpbbYR7,comment-id=00010000,timestamp=2018-03-23T22:13:52.341+0000)
yeah but tell me, how a single item counters 3 / 4 items ?
I don't understand the question.
Adaptive Helm (I think that's the name?) mitigates repeat damage, but it's not a hard counter. 20% absolutely is noticeable, which it should be, but it's not the be-all, end-all. A brand or Cass with a void staff, and a decent amount of AP, will still rip chunks out of a tank's health bar.
The "counter", I guess, is that the tank doesn't just fall over dead because said make looks at them wrong? Again.. that's intentional. Adaptive was added because "Dps mages", I.E. the repeat casters / % health DoT damage dealers, were killing tanks with lightning speed. The fact that it slows down their inevitable death vs those enemies is by design.
At the end of the day, again, mages aren't there to kill tanks. They can do it, but if you're pumping all of your damage into a tank then something's probably wrong.