Talk:Magic resistance/@comment-33825458-20171201024519/@comment-34616909-20180207135955

Your calculations are fine, except for one thing: 70 MR doesn't give you 70% dmg reduction.

70 MR -> x0.58 Magic damage (42% dmg reduction)

3800 HP x 1.42 = 5396 Efective health

So you need 10792 AP to one shot a tower

With 2248 AP + the items/runes mentioned in the last reply you are good.