20 from mask
20 from boots
10 (16) from passive
20 from scepter aura
that is -70 without masteries or runes and most people don't have that much res till way late game and your carry should be able to pick them off now. i have the mask and boots and my catalyst before 15 min usually have finished my rod on many occasions.
now i use the armor pen so at lvl 1-4 when im harassing the people in my lane with dark wind, my auto attack actually hurts. gotten tons of first bloods very fast because of this.